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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.

A208200 Number of nX7 0..3 arrays with new values 0..3 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)
1 715
2 10215440
3 153402542384
4 2303673397508915
5 34594950233928279876
6 519522527116810577984260
7 7801822458198433796561428608
8 117162260457319989881048135168019
9 1759460094015764611132758812387283596

List of values

[715, 10215440, 153402542384, 2303673397508915, 34594950233928279876, 519522527116810577984260, 7801822458198433796561428608, 117162260457319989881048135168019, 1759460094015764611132758812387283596]

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

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