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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 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 19 15:23 EDT 2021. Contains 348092 sequences. (Running on oeis4.)