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 A216464 #5 Jul 22 2025 23:32:37 %S A216464 5,52,1335,115975,20880505,6423127757,3030359756694,2043836470040286 %N A216464 Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of a 6Xn array with new integer colors introduced in row major order. %C A216464 Row 6 of A216460 %e A216464 Some solutions for n=4 %e A216464 ..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x %e A216464 ..x..2..x..3....x..2..x..0....x..2..x..3....x..2..x..3....x..2..x..3 %e A216464 ..3..x..4..x....3..x..4..x....4..x..0..x....1..x..4..x....4..x..1..x %e A216464 ..x..2..x..3....x..2..x..1....x..5..x..4....x..2..x..0....x..5..x..0 %e A216464 ..1..x..0..x....5..x..6..x....1..x..3..x....3..x..1..x....6..x..7..x %e A216464 ..x..2..x..1....x..1..x..3....x..4..x..5....x..2..x..0....x..4..x..2 %K A216464 nonn %O A216464 1,1 %A A216464 _R. H. Hardin_ Sep 07 2012