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A187634 Number of 4X4 0..n arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular 0
24, 1648, 14044, 106892, 306320, 1848504, 3549080, 9810932, 19774644, 44235868, 65964188, 188874084, 261388436, 423186604, 755637740, 1198594384, 1533264084, 2755012728, 3428332204, 5907685880, 8225807516 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A187633

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Some n=3 solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A019284 A333042 A112389 * A229430 A054777 A301392

Adjacent sequences:  A187631 A187632 A187633 * A187635 A187636 A187637

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified October 18 03:25 EDT 2021. Contains 348065 sequences. (Running on oeis4.)