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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.

A208427 Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).

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%I A208427 #8 May 04 2021 15:02:42
%S A208427 1,14,129,1292,50507,3673572,509698666,148054300100,84623199773631,
%T A208427 95553867727723732
%N A208427 Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).
%C A208427 Diagonal of A208434.
%e A208427 Some solutions for n=4
%e A208427 ..0..0..0..1....0..0..0..1....0..0..0..1....0..0..1..2....0..0..0..1
%e A208427 ..1..2..1..1....1..2..1..1....1..0..1..2....0..1..1..1....1..2..1..1
%e A208427 ..2..2..2..1....2..2..2..1....2..1..2..1....2..2..1..0....2..2..2..1
%e A208427 ..1..2..0..0....1..0..0..0....1..2..1..0....0..2..0..0....0..2..0..0
%Y A208427 Cf. A208434.
%K A208427 nonn
%O A208427 1,2
%A A208427 _R. H. Hardin_ Feb 26 2012

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