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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.

A209040 Number of n X n 0..3 arrays with no element equal the average of immediate neighbors vertically above and horizontally left of it.

Table of values

n a(n)
1 4
2 124
3 47700
4 225262148
5 13034933066892
6 9239962457023110368
7 80235179157233210417254036
8 8534774056580607728132307076396612
9 11121202754126311568095965858257048619933492

List of values

[4, 124, 47700, 225262148, 13034933066892, 9239962457023110368, 80235179157233210417254036, 8534774056580607728132307076396612, 11121202754126311568095965858257048619933492]

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

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