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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.

A220626 Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly one horizontal, diagonal and antidiagonal neighbor.

Table of values

n a(n)
1 1
2 2356
3 172833
4 49406943
5 8011414792
6 1637496710797
7 304265433695569
8 58792186589810692
9 11178980566694533181
10 2139705888320467053783
11 408438850253554118760672
12 78052060676212571885932839

List of values

[1, 2356, 172833, 49406943, 8011414792, 1637496710797, 304265433695569, 58792186589810692, 11178980566694533181, 2139705888320467053783, 408438850253554118760672, 78052060676212571885932839]

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

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