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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.

A208391 Number of nX7 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

Table of values

n a(n)
1 365
2 667476
3 1233536544
4 2278687944204
5 4209452449879284
6 7776176148498498768
7 14365030966055594634024
8 26536707847376158191040692
9 49021604272173916567275685956
10 90558244799577286285888604547504

List of values

[365, 667476, 1233536544, 2278687944204, 4209452449879284, 7776176148498498768, 14365030966055594634024, 26536707847376158191040692, 49021604272173916567275685956, 90558244799577286285888604547504]

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

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