A187706 - OEIS

A187706

Number of 3X3 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal

128, 1489, 8272, 31461, 93476, 235773, 524284, 1062857, 1999212, 3541677, 5967404, 9648841, 15048584, 22766353, 33534080, 48248321, 67983232, 94042589, 127929948, 171449249, 226655576, 295941137, 382036240, 488090685, 617595596, 774557293

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 2 of A187705

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..33

EXAMPLE

Some n=3 solutions for 3X3

..3..0..0....2..0..3....0..0..1....3..1..1....0..0..3....2..0..0....2..0..0

..2..0..3....2..0..0....3..0..1....0..0..0....0..0..3....1..0..0....0..0..0

..1..0..0....1..0..0....2..0..3....3..2..1....3..0..1....0..0..3....0..2..2