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A187629 Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular 0

%I

%S 10,24,24,954,954,194008,194008,196196792,196196792,1031851558448,

%T 1031851558448,27419179198175312,27419179198175312

%N Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular

%C Column 1 of A187633

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 12 2011

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Last modified September 21 12:28 EDT 2021. Contains 347598 sequences. (Running on oeis4.)