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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A284287 Number of possible legal open chains of a set of dominoes tiles with 0 to 2n pips.

Table of values

n a(n)
1 12
2 126720
3 7959229931520
4 10752728122249860612096000
5 829276462388385539562198269952000000000000
6 7969891788752886799729592752113502210704733844275200000000000000
7 18306383771271364475276585375748692499524930312437317320546133915243380736000000000000000000

List of values

[12, 126720, 7959229931520, 10752728122249860612096000, 829276462388385539562198269952000000000000, 7969891788752886799729592752113502210704733844275200000000000000, 18306383771271364475276585375748692499524930312437317320546133915243380736000000000000000000]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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