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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.

A220631 Number of ways to reciprocally link elements of an nX7 array either to themselves or to exactly two horizontal or antidiagonal neighbors.

Table of values

n a(n)
1 1
2 32
3 564
4 10695
5 201903
6 3817452
7 72097810
8 1362188752
9 25734606523
10 486186026515
11 9185167500820
12 173528846174065
13 3278357276282501
14 61935676290875214
15 1170106754973419295
16 22105996097313109325

List of values

[1, 32, 564, 10695, 201903, 3817452, 72097810, 1362188752, 25734606523, 486186026515, 9185167500820, 173528846174065, 3278357276282501, 61935676290875214, 1170106754973419295, 22105996097313109325]

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

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