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A187635 Number of 5X5 0..n arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular 0
954, 557382, 31903442, 686589106, 7836968262 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A187633

LINKS

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

EXAMPLE

Some n=3 solutions for 5X5

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

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

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

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

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

CROSSREFS

Sequence in context: A203024 A055161 A055158 * A076528 A260067 A031903

Adjacent sequences:  A187632 A187633 A187634 * A187636 A187637 A187638

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified May 26 07:30 EDT 2017. Contains 287093 sequences.