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

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

Crossrefs

Sequence in context: A083195 A004358 A006260 * A024303 A060195 A114201

Adjacent sequences: A187622 A187623 A187624 * A187626 A187627 A187628

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved