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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.

A209500 Number of nX5 0..4 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.

Table of values

n a(n)
1 52
2 9393
3 3268686
4 1165032679
5 416022303027
6 148562491090605
7 53052739133301878
8 18945498248887912305
9 6765569715455974117306
10 2416032108072507755319229
11 862781914811855377693247204

List of values

[52, 9393, 3268686, 1165032679, 416022303027, 148562491090605, 53052739133301878, 18945498248887912305, 6765569715455974117306, 2416032108072507755319229, 862781914811855377693247204]

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

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