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 A215956 #5 Jul 22 2025 23:28:22 %S A215956 2,12,366,6150,847594,30312074,10289785215,609400419815, %T A215956 392670408857828,33926900616984192,35986649547821568686 %N A215956 Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an nX5 array with new integer colors introduced in row major order. %C A215956 Column 5 of A215959 %e A215956 Some solutions for n=4 %e A215956 ..0..x..1..x..0....0..x..1..x..2....0..x..1..x..2....0..x..1..x..0 %e A215956 ..x..2..x..3..x....x..1..x..0..x....x..2..x..3..x....x..1..x..2..x %e A215956 ..4..x..5..x..4....1..x..0..x..1....1..x..3..x..1....1..x..3..x..4 %e A215956 ..x..1..x..4..x....x..0..x..2..x....x..0..x..4..x....x..0..x..4..x %K A215956 nonn %O A215956 1,1 %A A215956 _R. H. Hardin_ Aug 28 2012