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 A216028 #5 Jul 22 2025 23:29:14 %S A216028 1,12,97,6150,146327,30312074,1355988481,609400419815,42505520884540, %T A216028 33926900616984192,3335043669700991645 %N A216028 Number of horizontal, vertical and diagonal neighbor colorings of the odd squares of an nX5 array with new integer colors introduced in row major order. %C A216028 Column 5 of A216031 %e A216028 Some solutions for n=4 %e A216028 ..x..0..x..1..x....x..0..x..1..x....x..0..x..1..x....x..0..x..1..x %e A216028 ..1..x..2..x..3....0..x..2..x..3....2..x..3..x..4....0..x..2..x..0 %e A216028 ..x..4..x..0..x....x..4..x..0..x....x..5..x..4..x....x..2..x..0..x %e A216028 ..4..x..1..x..2....4..x..5..x..1....0..x..4..x..0....3..x..4..x..5 %K A216028 nonn %O A216028 1,2 %A A216028 _R. H. Hardin_ Aug 30 2012