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A187623 Number of (n+1)X(n+1) 0..3 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation 0
64, 2924, 390, 12278892, 4232368 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A187624
LINKS
EXAMPLE
Some solutions for 4X4
..1..0..2..3....1..1..0..1....1..3..2..3....2..1..0..2....1..2..1..2
..3..1..1..1....0..1..1..1....0..1..1..1....0..1..1..2....0..1..1..1
..1..1..1..3....1..1..1..0....1..1..1..0....1..1..1..1....1..1..1..0
..3..2..0..1....2..1..2..1....3..2..3..1....2..0..1..3....2..1..2..1
CROSSREFS
Sequence in context: A283696 A283128 A295714 * A187631 A221831 A282397
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 12 2011
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)