A187529 Number of 3X3 0..n arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under 90 degree rotation

0, 8, 74, 280, 784, 1970, 3580, 6946, 11726, 19100, 27672, 44092, 58988, 83340, 116344, 156470, 193434, 262028, 316330, 414216, 517530, 629058, 735548, 935702, 1100836, 1299196, 1530340, 1835766, 2068728, 2511536, 2794280, 3249058, 3723336

Offset

1,2

Comments

Row 2 of A187528

Links

R. H. Hardin, Table of n, a(n) for n = 1..36

Example

Some solutions for 3X3
..2..3..0....0..3..2....0..1..2....3..2..3....3..3..0....1..1..0....1..2..3
..1..3..1....1..3..1....2..2..2....1..1..2....1..2..1....1..3..2....1..1..1
..0..3..2....2..3..0....3..2..1....0..1..3....0..3..3....0..2..2....3..2..1

Crossrefs

Sequence in context: A225161 A195754 A137140 * A282880 A190953 A220458

Adjacent sequences: A187526 A187527 A187528 * A187530 A187531 A187532

Keyword

nonn

Author

R. H. Hardin Mar 10 2011

Status

approved