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Number of n X n symmetric 0..3 arrays with each element equal to the product mod 4 of two of its horizontal and vertical neighbors
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%I #5 Dec 18 2015 18:17:42

%S 0,2,10,212,9201,1236536,391565294,316110683652,658828649763119,

%T 3543427279193946969,48701064645083867200925

%N Number of n X n symmetric 0..3 arrays with each element equal to the product mod 4 of two of its horizontal and vertical neighbors

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jul 27 2011