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%I A223400 #4 Mar 19 2013 18:16:17
%S A223400 5096,943016,199425400,43699580872,9705525235832,2167784359988816,
%T A223400 485449397967176280,108848309856453879360,24421716229987194638264,
%U A223400 5481164676275390586552248,1230391852175808762117043648
%N A223400 4X4 square grid graph coloring a rectangular array: number of nX6 0..15 arrays where 0..15 label nodes of the square grid graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph
%C A223400 Column 6 of A223402
%H A223400 R. H. Hardin, <a href="/A223400/b223400.txt">Table of n, a(n) for n = 1..210</a>
%e A223400 Some solutions for n=3
%e A223400 ..4..0..4..0..1..5....4..0..4..5..1..0....4..0..1..5..9.10....4..0..4..8..9.13
%e A223400 ..0..4..0..4..5..9....0..4..5..1..5..1....0..1..2..6.10.11....0..4..0..4..8..9
%e A223400 ..4..5..1..0..4..8....4..0..1..2..1..2....4..0..1..5..9.10....4..0..1..0..4..5
%e A223400 Vertex neighbors:
%e A223400 0 -> 1 4
%e A223400 1 -> 0 2 5
%e A223400 2 -> 1 3 6
%e A223400 3 -> 2 7
%e A223400 4 -> 0 5 8
%e A223400 5 -> 4 1 6 9
%e A223400 6 -> 5 2 7 10
%e A223400 7 -> 6 3 11
%e A223400 8 -> 4 9 12
%e A223400 9 -> 8 5 10 13
%e A223400 10 -> 9 6 11 14
%e A223400 11 -> 10 7 15
%e A223400 12 -> 8 13
%e A223400 13 -> 12 9 14
%e A223400 14 -> 13 10 15
%e A223400 15 -> 14 11
%K A223400 nonn
%O A223400 1,1
%A A223400 _R. H. Hardin_ Mar 19 2013

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