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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.

A232069 Number of (n+1)X(n+1) 0..1 arrays with every element equal to some horizontal, diagonal or antidiagonal neighbor, with top left element zero.

Table of values

n a(n)
1 3
2 87
3 6624
4 2265691
5 3154769585
6 16761785898550
7 346245388962998639
8 27933597031900237580649
9 8787110268003730673863070121
10 10774541106851322777417902818902431

List of values

[3, 87, 6624, 2265691, 3154769585, 16761785898550, 346245388962998639, 27933597031900237580649, 8787110268003730673863070121, 10774541106851322777417902818902431]

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

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