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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.

A229405 Number of n X n 0..3 arrays avoiding 11 horizontally, 22 vertically, 33 antidiagonally and 00 diagonally.

Table of values

n a(n)
1 4
2 163
3 53538
4 142475606
5 3113479414050
6 555943964324988272
7 812793729526357032659346
8 9723835061406716550009482645332
9 952115739439339063251356375563511227580

List of values

[4, 163, 53538, 142475606, 3113479414050, 555943964324988272, 812793729526357032659346, 9723835061406716550009482645332, 952115739439339063251356375563511227580]

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

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