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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.

A284328 Number of n X n 0..1 arrays with the number of 1's horizontally, diagonally or antidiagonally adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.

Table of values

n a(n)
1 1
2 4
3 49
4 5130
5 1792007
6 3063494246
7 20513380740103
8 582475612060753356

List of values

[1, 4, 49, 5130, 1792007, 3063494246, 20513380740103, 582475612060753356]

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

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