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A187696
Number of (n+1)X(n+1) 0..1 arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.
0
6, 0, 104, 0, 9350, 0, 4280018, 0, 9966761956, 0, 118224466422070, 0, 7149599148533804130, 0, 2205540801307910506482568, 0
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OFFSET
1,1
COMMENTS
Column 1 of
A187699
LINKS
Table of n, a(n) for n=1..16.
EXAMPLE
Some solutions for 4X4
..1..0..1..1....1..1..0..1....1..1..1..1....1..1..0..1....0..1..0..1
..1..1..0..1....1..0..1..1....1..0..1..0....1..0..1..0....1..0..1..0
..1..0..1..0....0..1..0..1....1..1..0..1....0..1..0..1....0..1..0..1
..1..1..0..1....1..0..1..1....1..0..1..0....1..1..1..0....1..1..1..0
CROSSREFS
Sequence in context:
A072129
A085511
A187525
*
A005212
A167028
A246137
Adjacent sequences:
A187693
A187694
A187695
*
A187697
A187698
A187699
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Mar 12 2011
STATUS
approved
