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 A216077 #7 Jul 22 2025 23:29:34 %S A216077 1,1,5,602,373780,33093252880,14216413305846436, %T A216077 2562708724272040433794232,2209363619821632289359062591728192 %N A216077 Number of horizontal and antidiagonal neighbor colorings of the odd squares of an n X n array with new integer colors introduced in row major order. %C A216077 Diagonal of A216084 %e A216077 Some solutions for n=4 %e A216077 ..x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1....x..0..x..1 %e A216077 ..2..x..3..x....2..x..3..x....2..x..3..x....2..x..0..x....2..x..3..x %e A216077 ..x..4..x..3....x..2..x..4....x..2..x..3....x..3..x..4....x..1..x..3 %e A216077 ..3..x..4..x....0..x..2..x....0..x..2..x....5..x..3..x....3..x..4..x %K A216077 nonn %O A216077 1,3 %A A216077 _R. H. Hardin_ Sep 01 2012