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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.

A220685 Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly two horizontal, vertical or antidiagonal neighbors.

Table of values

n a(n)
1 1
2 114
3 5851
4 312603
5 15978924
6 822649205
7 42362190063
8 2181341369109
9 112319870453715
10 5783510938076077
11 297801401665428743
12 15334225523450669062
13 789581475759386788696
14 40656693721278204870112

List of values

[1, 114, 5851, 312603, 15978924, 822649205, 42362190063, 2181341369109, 112319870453715, 5783510938076077, 297801401665428743, 15334225523450669062, 789581475759386788696, 40656693721278204870112]

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

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