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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.

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%I A220326 #5 Jul 23 2025 01:03:34
%S A220326 7,174,4062,92093,2065264,46094354,1026529800,22841390408,
%T A220326 508110710307,11302385499363,251409042152240,5592331837970994,
%U A220326 124395540371693940,2767041352339397099
%N 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.
%C A220326 Column 5 of A220328
%e A220326 Some solutions for n=3
%e A220326 ..0..1..0..0..0....0..1..1..1..1....0..1..0..1..1....0..1..0..0..0
%e A220326 ..1..0..0..0..1....0..0..0..1..0....0..0..1..0..0....1..0..1..1..1
%e A220326 ..0..1..0..1..0....0..0..0..1..0....0..0..0..1..0....0..0..0..0..0
%K A220326 nonn
%O A220326 1,1
%A A220326 _R. H. Hardin_ Dec 10 2012

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