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A186164 1/4 the number of nX5 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 1

%I #5 Mar 31 2012 12:36:04

%S 7,2175,253341,37402872,5033988714,704281652979,96951738076992,

%T 13435825601048421,1856827788245959473,256908205340960558187,

%U 35528479510856892673200,4914300705034627821533085

%N 1/4 the number of nX5 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

%C Column 5 of A186168

%H R. H. Hardin, <a href="/A186164/b186164.txt">Table of n, a(n) for n = 1..21</a>

%e Some solutions for 4X5 with a(1,1)=0

%e ..0..0..0..1..1....0..0..0..0..0....0..0..0..3..3....0..0..0..2..2

%e ..0..2..0..1..2....0..2..1..1..1....0..2..0..1..3....0..2..0..2..1

%e ..1..2..2..1..2....0..2..2..3..3....0..2..2..1..1....0..2..0..3..1

%e ..1..1..0..0..2....3..3..3..0..0....0..3..3..0..0....0..2..0..3..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 13 2011

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Last modified September 23 14:07 EDT 2023. Contains 365551 sequences. (Running on oeis4.)