cp's OEIS Frontend

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.

A203654 1/25 the number of (n+1)X7 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 531441
2 178019197
3 71156938905
4 30292030417413
5 13192335511091073
6 5796397762880763341
7 2554890395768832271017
8 1127594169687376371159253
9 497870086469175871336506385
10 219871060492143544799371582749

List of values

[531441, 178019197, 71156938905, 30292030417413, 13192335511091073, 5796397762880763341, 2554890395768832271017, 1127594169687376371159253, 497870086469175871336506385, 219871060492143544799371582749]

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

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