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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.

A209012 Number of n X n 0..3 arrays with no element equal the average of immediate neighbors vertically above, diagonally above and left, and horizontally left of it.

Table of values

n a(n)
1 4
2 130
3 57412
4 337083370
5 26361689168962
6 27444816617702590210
7 380386826513820237531618354
8 70188235698940395931354096660136964
9 172416055686564260854366909730038107238333862

List of values

[4, 130, 57412, 337083370, 26361689168962, 27444816617702590210, 380386826513820237531618354, 70188235698940395931354096660136964, 172416055686564260854366909730038107238333862]

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

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