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A187707
Number of 4X4 0..n arrays with each 2X2 subblock off diagonal and antidiagonal nonsingular and the array of 2X2 subblock determinants antisymmetric about the diagonal and antidiagonal.
0
2, 72, 322, 1718, 2904, 9834, 13324, 31000, 49910, 84760, 98226, 211526, 234336, 325654, 454612, 691052, 742006, 1152832, 1224538, 1765938
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OFFSET
1,1
COMMENTS
Row 3 of
A187705
LINKS
Table of n, a(n) for n=1..20.
EXAMPLE
Some n=3 solutions for 4X4
..1..1..0..0....1..3..0..0....0..0..1..1....0..3..1..2....0..2..0..0
..2..2..2..2....1..3..2..3....1..1..1..1....0..1..1..2....0..2..1..3
..2..1..1..0....3..3..2..0....0..1..1..2....2..2..2..2....1..2..1..1
..0..0..2..0....0..0..2..0....0..1..0..0....0..0..1..1....1..2..2..2
CROSSREFS
Sequence in context:
A383350
A053318
A272757
*
A163274
A030993
A283568
Adjacent sequences:
A187704
A187705
A187706
*
A187708
A187709
A187710
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Mar 12 2011
STATUS
approved
