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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.

A221292 Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 4Xn array.

Table of values

n a(n)
1 1
2 37
3 556
4 9107
5 172904
6 2890017
7 49684593
8 821323042
9 13475380990

List of values

[1, 37, 556, 9107, 172904, 2890017, 49684593, 821323042, 13475380990]

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

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