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 A264943 #3 Nov 29 2015 06:03:33 %S A264943 0,1,2350,11375145,137409486772,3537141103745065, %T A264943 173357342638694530002,14844736259829478729001905 %N A264943 Number of nX5 arrays of permutations of 5 copies of 0..n-1 with no equal horizontal neighbors and new values introduced sequentially from 0. %C A264943 Column 5 of A264945. %e A264943 Some solutions for n=3 %e A264943 ..0..1..2..0..1....0..1..2..1..2....0..1..2..1..2....0..1..0..2..1 %e A264943 ..0..2..0..1..2....1..2..1..0..2....2..0..2..0..1....1..2..0..1..0 %e A264943 ..1..2..1..0..2....0..2..0..1..0....1..0..2..0..1....2..0..2..1..2 %Y A264943 Cf. A264945. %K A264943 nonn %O A264943 1,3 %A A264943 _R. H. Hardin_, Nov 29 2015