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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.

A208346 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).

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%I A208346 #8 Jun 02 2025 07:43:34
%S A208346 1,15,1095,230387,191586797,647640659639
%N A208346 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors).
%C A208346 Diagonal of A208353
%e A208346 Some solutions for n=4
%e A208346 ..0..1..1..0....0..0..1..0....0..0..1..0....0..1..1..1....0..0..0..0
%e A208346 ..0..1..2..0....2..1..1..2....0..2..2..1....0..0..1..2....1..1..1..1
%e A208346 ..0..2..2..2....2..3..1..0....3..3..3..0....3..3..3..3....2..2..2..3
%e A208346 ..3..1..2..0....2..3..3..2....1..3..0..0....1..2..1..2....0..2..3..0
%K A208346 nonn
%O A208346 1,2
%A A208346 _R. H. Hardin_ Feb 25 2012

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