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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.

A220561 Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly one horizontal or antidiagonal neighbor.

Table of values

n a(n)
1 21
2 1544
3 101052
4 6743873
5 449429440
6 29955561052
7 1996515036228
8 133064181801048
9 8868465829053416
10 591065515195237024
11 39393331961841054032
12 2625486595153945514656
13 174983417444316851450400

List of values

[21, 1544, 101052, 6743873, 449429440, 29955561052, 1996515036228, 133064181801048, 8868465829053416, 591065515195237024, 39393331961841054032, 2625486595153945514656, 174983417444316851450400]

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

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