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A187701 Number of (n+1)X(n+1) 0..2 arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal 0
31, 1489, 72, 5030, 36, 7410, 474, 176936 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A187705

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A057008 A159487 A130661 * A185512 A221444 A185665

Adjacent sequences:  A187698 A187699 A187700 * A187702 A187703 A187704

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified June 28 17:31 EDT 2022. Contains 354907 sequences. (Running on oeis4.)