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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.

A208268 Number of nX7 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors.

Table of values

n a(n)
1 64
2 4021
3 273205
4 18403423
5 1240971177
6 83670667271
7 5641457245533
8 380372051615157
9 25646375739266275
10 1729192685453990877
11 116589859961103508219
12 7861006788319434001589
13 530024032549172830292655

List of values

[64, 4021, 273205, 18403423, 1240971177, 83670667271, 5641457245533, 380372051615157, 25646375739266275, 1729192685453990877, 116589859961103508219, 7861006788319434001589, 530024032549172830292655]

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

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