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The Encyclopedia of Integer Sequences
"... This article gives a brief introduction to the OnLine Encyclopedia of Integer Sequences (or OEIS). The OEIS is a database of nearly 90,000 sequences of integers, arranged lexicographically. The entry for a sequence lists the initial terms (50 to 100, if available), a description, formulae, programs ..."
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Cited by 631 (15 self)
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This article gives a brief introduction to the OnLine Encyclopedia of Integer Sequences (or OEIS). The OEIS is a database of nearly 90,000 sequences of integers, arranged lexicographically. The entry for a sequence lists the initial terms (50 to 100, if available), a description, formulae, programs to generate the sequence, references, links to relevant web pages, and other
Some Easily Derivable Integer Sequences
 J. Integer Seq
, 2000
"... We propose and discuss several simple ways of obtaining new enumerative sequences from existing ones. For instance, the number of graphs considered up to the action of an involutory transformation is expressible as the semisum of the total number of such graphs and the number of graphs invariant un ..."
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Cited by 3 (1 self)
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We propose and discuss several simple ways of obtaining new enumerative sequences from existing ones. For instance, the number of graphs considered up to the action of an involutory transformation is expressible as the semisum of the total number of such graphs and the number of graphs invariant under the involution. Another, less familiar idea concerns even and oddedged graphs: the di#erence between their numbers often proves to be a very simple quantity (such as n!). More than 30 new sequences will be constructed by these methods.
The Number of Hierarchical Orderings
 Order
, 2003
"... An ordered setpartition (or preferential arrangement) of n labeled elements represents a single "hierarchy" ..."
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Cited by 2 (2 self)
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An ordered setpartition (or preferential arrangement) of n labeled elements represents a single "hierarchy"