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A187629 Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular 0
10, 24, 24, 954, 954, 194008, 194008, 196196792, 196196792, 1031851558448, 1031851558448, 27419179198175312, 27419179198175312 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A187633

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for 4X4

..0..1..1..0....1..0..0..1....1..0..0..1....0..1..1..1....1..1..1..0

..1..0..0..1....0..1..1..1....1..1..1..1....1..0..0..1....1..0..0..1

..1..0..0..1....0..1..1..1....1..1..1..1....1..0..0..1....1..0..0..1

..1..1..1..1....1..0..0..1....1..0..0..1....1..1..1..1....0..1..1..0

CROSSREFS

Sequence in context: A250797 A250583 A223415 * A175403 A133503 A175425

Adjacent sequences:  A187626 A187627 A187628 * A187630 A187631 A187632

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified July 27 04:32 EDT 2021. Contains 346305 sequences. (Running on oeis4.)