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 A216463 #5 Jul 22 2025 23:32:31 %S A216463 5,15,322,4140,580479,18171918,6423148007,346212390266, %T A216463 232431640956990,18633407258171930,20538497277155387947 %N A216463 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 5Xn array with new integer colors introduced in row major order. %C A216463 Row 5 of A216460 %e A216463 Some solutions for n=4 %e A216463 ..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x %e A216463 ..x..2..x..3....x..2..x..3....x..2..x..3....x..2..x..3....x..2..x..3 %e A216463 ..3..x..4..x....0..x..1..x....4..x..1..x....4..x..5..x....1..x..0..x %e A216463 ..x..5..x..3....x..3..x..0....x..0..x..4....x..1..x..4....x..2..x..4 %e A216463 ..3..x..6..x....4..x..5..x....2..x..3..x....3..x..5..x....4..x..0..x %K A216463 nonn %O A216463 1,1 %A A216463 _R. H. Hardin_ Sep 07 2012