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A187518 Number of (n+1)X(n+1) 0..3 arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero 0
64, 450, 4200, 73764, 2048596, 129034386, 13881494364 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A187521

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A181210 A092211 A130812 * A221070 A297844 A233304

Adjacent sequences:  A187515 A187516 A187517 * A187519 A187520 A187521

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2011

STATUS

approved

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Last modified June 22 10:56 EDT 2021. Contains 345375 sequences. (Running on oeis4.)