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A226709
Number of n X n (-1,0,1) arrays of determinants of 2X2 subblocks of some (n+1)X(n+1) binary array
0
3, 71, 4671, 977939, 833949273, 2753775365011, 33686064493125445
OFFSET
1,1
COMMENTS
Diagonal of A226717
EXAMPLE
Some solutions for n=3
.-1..1..0...-1..0..0....1.-1..1....0..0..0....1.-1..1...-1.-1..0....0..1.-1
..1..0.-1....1..0..0...-1..0..1....0.-1..1....0.-1..0....1..0..0....0..0..1
.-1..0..1....1..0..1....1..0..0...-1..0..0....1..0..0...-1..0..0....1..0.-1
CROSSREFS
Sequence in context: A111649 A349072 A272657 * A226844 A300540 A334124
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 15 2013
STATUS
approved