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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.

A203655 1/25 the number of (n+1)X8 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 4782969
2 3295578857
3 2843024036697
4 2669260624372937
5 2592476403527692089
6 2554890395768832271017
7 2533535485859974387986201
8 2519204090844384026262668425
9 2507880611006135260374020018937

List of values

[4782969, 3295578857, 2843024036697, 2669260624372937, 2592476403527692089, 2554890395768832271017, 2533535485859974387986201, 2519204090844384026262668425, 2507880611006135260374020018937]

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

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