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%I #5 Mar 31 2012 12:36:06
%S 0,3783,5903759,47796308777,1557834542977401,226578401020498502579
%N 1/729 the number of (n+2)X(n+2) 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace
%C Diagonal of A186962
%e Some solutions for 4X4
%e ..0..0..0..0....1..0..0..0....1..0..0..0....2..0..0..0....1..0..0..0
%e ..2..2..1..1....0..1..1..2....2..0..1..1....1..0..1..0....0..2..2..1
%e ..0..0..0..1....0..1..1..2....2..2..2..2....1..1..0..0....2..2..0..2
%e ..2..0..0..0....2..0..2..1....2..2..0..2....1..1..0..1....2..0..1..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Mar 01 2011