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%I A211092 #5 Dec 18 2015 18:18:08
%S A211092 0,1,1,19,136,3496,100204,6012109,537556135,86449986124,
%T A211092 22576823498161,10130717811503530,7577956550025798379
%N A211092 1/4 the number of n X n 0..3 symmetric matrices with every element equal to two or three horizontal and vertical neighbors
%e A211092 Some solutions for n=4
%e A211092 ..3..3..2..2....0..0..2..2....3..3..0..0....2..2..2..2....3..3..1..1
%e A211092 ..3..3..2..2....0..0..2..2....3..3..0..0....2..2..2..2....3..3..1..1
%e A211092 ..2..2..2..2....2..2..3..3....0..0..0..0....2..2..3..3....1..1..1..1
%e A211092 ..2..2..2..2....2..2..3..3....0..0..0..0....2..2..3..3....1..1..1..1
%K A211092 nonn
%O A211092 1,4
%A A211092 _R. H. Hardin_ Mar 31 2012

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