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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.

A265450 Number of n X n 0..2n-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.

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%I A265450 #5 Dec 18 2015 18:18:54
%S A265450 1,18,7422,13943772,122895678174,5327856426356284,
%T A265450 1191337567990711362900,1410907091881274891065515756
%N A265450 Number of n X n 0..2n-2 arrays with each element differing from its horizontal and vertical neighbors by one or two.
%C A265450 Diagonal of A265458.
%e A265450 Some solutions for n=3
%e A265450 ..2..0..2....1..3..2....3..2..4....0..1..3....0..1..3....2..0..2....2..0..1
%e A265450 ..1..2..1....3..1..3....2..0..2....1..3..1....1..0..1....0..2..3....3..1..3
%e A265450 ..2..1..0....1..0..1....4..2..1....2..4..3....0..1..3....1..3..1....1..0..1
%Y A265450 Cf. A265458.
%K A265450 nonn
%O A265450 1,2
%A A265450 _R. H. Hardin_, Dec 09 2015

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