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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.

A232154 Number of n X n 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, vertically or antidiagonally, and no adjacent values equal.

Table of values

n a(n)
1 1
2 18
3 290
4 7770
5 382996
6 36275078
7 6564512068
8 2246994465516
9 1482101422338982
10 1881388287368571956

List of values

[1, 18, 290, 7770, 382996, 36275078, 6564512068, 2246994465516, 1482101422338982, 1881388287368571956]

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

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