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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.

A203833 Number of (n+1)X7 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 140625
2 11669859
3 1043088057
4 95763046491
5 8882824128417
6 827309554361235
7 77176081545485769
8 7204002753036584331
9 672627208587089667633
10 62808488037897381676611
11 5865153683164077390051033

List of values

[140625, 11669859, 1043088057, 95763046491, 8882824128417, 827309554361235, 77176081545485769, 7204002753036584331, 672627208587089667633, 62808488037897381676611, 5865153683164077390051033]

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

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