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A187621 Number of (n+1)X(n+1) 0..1 arrays with each 2X2 non-center subblock determinant nonzero and the array of 2X2 subblock determinants antisymmetric under 90 degree rotation 0
10, 24, 2, 948, 36, 190972, 3020, 194618700, 929380, 1018751442652, 1744283776, 27189851221308572, 15262275217840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A187624

LINKS

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

EXAMPLE

All solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A250188 A177126 A300150 * A231880 A102089 A250797

Adjacent sequences:  A187618 A187619 A187620 * A187622 A187623 A187624

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified October 28 04:43 EDT 2021. Contains 348313 sequences. (Running on oeis4.)