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A187632 Number of (n+1)X(n+1) 0..4 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular 0
113, 12104, 106892, 686589106, 795758912 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A187633

LINKS

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

EXAMPLE

Some solutions for 4X4

..3..1..3..0....0..4..4..4....0..4..3..2....0..2..4..0....1..4..4..4

..3..0..0..1....1..0..0..1....3..0..0..4....2..0..0..1....1..0..0..1

..1..0..0..3....2..0..0..1....4..0..0..3....1..0..0..2....4..0..0..1

..3..3..1..0....1..2..4..0....2..3..4..2....2..4..2..0....4..1..4..3

CROSSREFS

Sequence in context: A250052 A175687 A090480 * A218809 A218195 A218371

Adjacent sequences:  A187629 A187630 A187631 * A187633 A187634 A187635

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified September 21 13:58 EDT 2021. Contains 347598 sequences. (Running on oeis4.)