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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.

A220599 Number of ways to reciprocally link elements of an nX5 array either to themselves or to exactly two horizontal, vertical and antidiagonal neighbors, without 3-loops.

Table of values

n a(n)
1 1
2 44
3 3469
4 167614
5 7558495
6 352586943
7 16505365334
8 770615995060
9 35978245868462
10 1680090131446571
11 78453960278374893
12 3663456651896335065
13 171068067072237399646
14 7988166245960912052019
15 373013938796405801398629

List of values

[1, 44, 3469, 167614, 7558495, 352586943, 16505365334, 770615995060, 35978245868462, 1680090131446571, 78453960278374893, 3663456651896335065, 171068067072237399646, 7988166245960912052019, 373013938796405801398629]

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

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