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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.

A220546 Number of ways to reciprocally link elements of an n X n array either to themselves or to exactly one horizontal, vertical or antidiagonal neighbor.

Table of values

n a(n)
1 1
2 8
3 224
4 32173
5 21668208
6 69961268156
7 1077372801893440
8 79222784184855853978
9 27809964251933826835780981
10 46605836505704256743057461864323

List of values

[1, 8, 224, 32173, 21668208, 69961268156, 1077372801893440, 79222784184855853978, 27809964251933826835780981, 46605836505704256743057461864323]

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

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