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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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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
THE LONG AND THE SHORT ON COUNTING SEQUENCES
"... S0 consists of two 1’s, one 2, and one 4, so let us define S1 to be this description: S1 = 2, 1, 1, 2, 1, 4. Repeating this process, S1 consists of three 1’s, two 2’s and one 4, so set S2 = 3, 1, 2, 2, 1, 4. Continuing in this way for several more steps produces ..."
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S0 consists of two 1’s, one 2, and one 4, so let us define S1 to be this description: S1 = 2, 1, 1, 2, 1, 4. Repeating this process, S1 consists of three 1’s, two 2’s and one 4, so set S2 = 3, 1, 2, 2, 1, 4. Continuing in this way for several more steps produces