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.
%I A220934 #6 Jul 23 2025 01:33:09 %S A220934 7,200,5912,172904,4983202,143495572,4129000493,118791182035, %T A220934 3417440488681,98313052773312,2828261800424005,81363108971612428, %U A220934 2340643785326878730,67335342944117783361,1937094540263542667587 %N A220934 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..2 nX5 array. %C A220934 Column 5 of A220935 %H A220934 R. H. Hardin, <a href="/A220934/b220934.txt">Table of n, a(n) for n = 1..16</a> %e A220934 Some solutions for n=3 %e A220934 ..0..1..0..1..1....0..0..1..0..0....0..1..1..0..0....0..0..0..0..1 %e A220934 ..0..0..0..0..1....1..1..1..0..0....1..0..0..0..0....0..1..0..0..1 %e A220934 ..0..1..1..1..0....0..0..1..1..0....0..0..0..1..0....0..0..0..1..0 %K A220934 nonn %O A220934 1,1 %A A220934 _R. H. Hardin_ Dec 25 2012