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A187523 Number of 4X4 0..n arrays with the array of 2X2 subblock determinants antisymmetric and no off-diagonal 2X2 subblock determinant zero 0
2, 354, 4200, 34776, 107990, 475370, 978568, 2790760, 5647886, 11787078, 17703910, 41527872, 57261832 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A187521

LINKS

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

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A024350 A012669 A278926 * A172860 A164700 A230688

Adjacent sequences:  A187520 A187521 A187522 * A187524 A187525 A187526

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2011

STATUS

approved

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Last modified July 5 17:29 EDT 2020. Contains 335473 sequences. (Running on oeis4.)