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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.

A220937 Equals two maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..2 3Xn array.

Table of values

n a(n)
1 1
2 12
3 92
4 673
5 5912
6 48212
7 395844
8 3232729
9 26184472
10 211363254

List of values

[1, 12, 92, 673, 5912, 48212, 395844, 3232729, 26184472, 211363254]

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

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