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 A220253 #5 Jul 23 2025 00:59:18 %S A220253 24,928,31744,1048576,33350528,1073741824 %N A220253 Sum of neighbor maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their king-move neighbors in a random 0..2 nX5 array. %C A220253 Column 5 of A220254 %e A220253 Some solutions for n=3 %e A220253 ..1..0..0..0..1....0..1..0..0..0....0..1..0..0..0....1..0..0..1..0 %e A220253 ..1..0..0..0..0....0..1..0..0..1....0..0..0..0..0....0..0..0..0..1 %e A220253 ..0..1..0..0..1....0..0..0..0..0....0..1..1..1..1....1..0..1..1..1 %K A220253 nonn %O A220253 1,1 %A A220253 _R. H. Hardin_ Dec 08 2012