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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.

A220326 Equals two maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 nX5 array.

Table of values

n a(n)
1 7
2 174
3 4062
4 92093
5 2065264
6 46094354
7 1026529800
8 22841390408
9 508110710307
10 11302385499363
11 251409042152240
12 5592331837970994
13 124395540371693940
14 2767041352339397099

List of values

[7, 174, 4062, 92093, 2065264, 46094354, 1026529800, 22841390408, 508110710307, 11302385499363, 251409042152240, 5592331837970994, 124395540371693940, 2767041352339397099]

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

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