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Number of (n+1)X(n+1) 0..2 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero
0

%I #5 Mar 31 2012 12:37:05

%S 56,2773,640652,586841773,3156944585806

%N Number of (n+1)X(n+1) 0..2 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero

%C Diagonal of A205235

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 24 2012