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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.

A363586 a(n) is the number of mappings X:{{1..n} choose 3}->{+,-} such that X(a,b,c) = X(b,c,d) implies X(a,b,c) = X(a,b,d) = X(a,c,d) = X(b,c,d) for a < b < c < d.

Table of values

n a(n)
3 2
4 10
5 120
6 3284
7 199724
8 26680618
9 7782067930
10 4936744315756

List of values

[2, 10, 120, 3284, 199724, 26680618, 7782067930, 4936744315756]

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

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