A187625 - OEIS

A187625

Number of 3X3 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation

24, 446, 2924, 12104, 37448, 98014, 221640, 457632, 871712, 1562702, 2649632, 4329136, 6782660, 10323450, 15291860, 22111560, 31246860, 43422938, 59215112, 79658992, 105617736, 138251814, 178796912, 229108212, 290437464, 364933542

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OFFSET

1,1

COMMENTS

Row 2 of A187624

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..35

EXAMPLE

Some n=3 solutions for 3X3

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

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

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