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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.

A220686 Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two horizontal, vertical or antidiagonal neighbors.

Table of values

n a(n)
1 1
2 351
3 46027
4 6349886
5 822649205
6 107713940118
7 14108684022136
8 1848014307847883
9 242044667782801540
10 31702119421997470360
11 4152232349834304063419
12 543844751860183504221026

List of values

[1, 351, 46027, 6349886, 822649205, 107713940118, 14108684022136, 1848014307847883, 242044667782801540, 31702119421997470360, 4152232349834304063419, 543844751860183504221026]

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

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