A187627 - OEIS

A187627

Number of 5X5 0..n arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation

948, 324452, 12278892, 221177664, 1896404966

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

OFFSET

1,1

COMMENTS

Row 4 of A187624

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some n=3 solutions for 5X5

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

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

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

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

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

CROSSREFS

Sequence in context: A199924 A215950 A192770 * A170830 A020366 A217936

Adjacent sequences: A187624 A187625 A187626 * A187628 A187629 A187630

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved