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 A265455 #4 Dec 09 2015 09:59:58 %S A265455 360,42282,6056182,871209026,122895678174,16879041018070, %T A265455 2268041942592142,299048113399679982,38840546858752416798, %U A265455 4980829532639930253638,632088592086702141594594 %N A265455 Number of nX5 0..n+5-2 arrays with each element differing from its horizontal and vertical neighbors by one or two. %C A265455 Column 5 of A265458. %H A265455 R. H. Hardin, <a href="/A265455/b265455.txt">Table of n, a(n) for n = 1..127</a> %e A265455 Some solutions for n=2 %e A265455 ..0..1..3..2..4....2..1..3..1..3....0..1..3..1..3....2..3..1..2..1 %e A265455 ..1..2..1..3..2....3..2..1..3..1....2..0..2..3..2....4..2..0..1..2 %Y A265455 Cf. A265458. %K A265455 nonn %O A265455 1,1 %A A265455 _R. H. Hardin_, Dec 09 2015