cp's OEIS Frontend

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.

A268621 Number of n X n 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totaling two no more than once.

Table of values

n a(n)
1 3
2 42
3 1086
4 55452
5 6000978
6 1430057208
7 767057092212
8 938662461734076
9 2643885168776274078
10 17245474696462104041796
11 261641272761781630830646332
12 9262823664147270920479995625968
13 767111588793900754143144516979246884

List of values

[3, 42, 1086, 55452, 6000978, 1430057208, 767057092212, 938662461734076, 2643885168776274078, 17245474696462104041796, 261641272761781630830646332, 9262823664147270920479995625968, 767111588793900754143144516979246884]

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

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