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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.

A183812 1/81 the number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

Table of values

n a(n)
1 1
2 162
3 163208
4 1042063656
5 41531687999736
6 10425296660739253420

List of values

[1, 162, 163208, 1042063656, 41531687999736, 10425296660739253420]

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

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