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A187702 Number of (n+1) X (n+1) 0..3 arrays with each 2 X 2 subblock off diagonal and antidiagonal nonsingular and the array of 2 X 2 subblock determinants antisymmetric about the diagonal and antidiagonal. 0
64, 8272, 322, 81456, 530, 230446 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A187705.

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for 4 X 4

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

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

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

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

CROSSREFS

Cf. A187705.

Sequence in context: A317516 A300181 A183499 * A184764 A239647 A222140

Adjacent sequences:  A187699 A187700 A187701 * A187703 A187704 A187705

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified August 15 14:44 EDT 2022. Contains 356146 sequences. (Running on oeis4.)