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A183820 1/256 the number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor 0

%I

%S 1,813,8538066,1163575148283,2051388696859571241

%N 1/256 the number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor

%C Diagonal of A183827

%e Some solutions with upper left block zero for 3X3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 07 2011

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Last modified August 11 15:10 EDT 2022. Contains 356066 sequences. (Running on oeis4.)