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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.

A230169 Number of n X n 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 0
2 27
3 3787
4 4722977
5 49754476927
6 4381081731832923
7 3274958849115023706081

List of values

[0, 27, 3787, 4722977, 49754476927, 4381081731832923, 3274958849115023706081]

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

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