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 A215957 #5 Jul 22 2025 23:28:29 %S A215957 2,34,1534,145563,30312074,9260821180,4761748786964,3146896493234825 %N A215957 Number of horizontal, vertical and diagonal neighbor colorings of the even squares of an nX6 array with new integer colors introduced in row major order. %C A215957 Column 6 of A215959 %e A215957 Some solutions for n=4 %e A215957 ..0..x..1..x..2..x....0..x..1..x..2..x....0..x..1..x..2..x....0..x..1..x..0..x %e A215957 ..x..1..x..3..x..0....x..1..x..3..x..4....x..3..x..4..x..0....x..2..x..0..x..3 %e A215957 ..3..x..2..x..0..x....1..x..0..x..5..x....1..x..5..x..0..x....1..x..0..x..4..x %e A215957 ..x..4..x..5..x..6....x..5..x..1..x..3....x..0..x..3..x..6....x..3..x..5..x..6 %K A215957 nonn %O A215957 1,1 %A A215957 _R. H. Hardin_ Aug 28 2012