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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.

A220636 Number of ways to reciprocally link elements of an 6Xn array either to themselves or to exactly two horizontal or antidiagonal neighbors.

Table of values

n a(n)
1 1
2 1
3 13
4 351
5 8560
6 183961
7 3817452
8 79063898
9 1643423543
10 34184820039
11 711142299027
12 14793696906106
13 307746212613995
14 6401868705356519
15 133174202661890384
16 2770341001987547086
17 57629691849567578540

List of values

[1, 1, 13, 351, 8560, 183961, 3817452, 79063898, 1643423543, 34184820039, 711142299027, 14793696906106, 307746212613995, 6401868705356519, 133174202661890384, 2770341001987547086, 57629691849567578540]

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

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