A226715 Number of n X 6 (-1,0,1) arrays of determinants of 2 X 2 subblocks of some (n+1) X 7 binary array.

491, 80043, 6045209, 439030021, 34404755041, 2753775365011, 219013376708219, 17350805966693235, 1374728293480549343, 108981170244590729059, 8640242984064796760609, 684976188236943531208499

Offset

1,1

Comments

Column 6 of A226717.

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

Some solutions for n=3
.-1.-1..0..0..1..0...-1.-1..0..1..0..0...-1.-1..0..1.-1..1...-1.-1..0..0.-1..1
..1..1..0..0.-1..0....1..1..0.-1..1..1...-1..1..0.-1..0..0....0..1..0..0.-1..0
..0..1.-1..0..1..0....0.-1..0..0..0.-1....1.-1..1..1..0.-1....1..0..0..0..1..0

Crossrefs

Cf. A226717.

Sequence in context: A205200 A205058 A229520 * A205819 A234672 A234667

Adjacent sequences: A226712 A226713 A226714 * A226716 A226717 A226718

Keyword

nonn

Author

R. H. Hardin, Jun 15 2013

Status

approved