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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.

A183815 1/81 the number of (n+1) X 5 0..2 arrays with no 2 X 2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor.

Table of values

n a(n)
1 512
2 65640
3 8231592
4 1042063656
5 131467169720
6 16607782066704
7 2096961683069192
8 264820293988996048
9 33441129238755694072
10 4223013161022170839808
11 533285078101618075961512

List of values

[512, 65640, 8231592, 1042063656, 131467169720, 16607782066704, 2096961683069192, 264820293988996048, 33441129238755694072, 4223013161022170839808, 533285078101618075961512]

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

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