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A187701 Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal 0

%I

%S 31,1489,72,5030,36,7410,474,176936

%N Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal

%C Column 2 of A187705

%e Some solutions for 4X4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 12 2011

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Last modified August 19 18:30 EDT 2022. Contains 356229 sequences. (Running on oeis4.)