A184759 Half the number of nX7 binary arrays with no 1 having an adjacent 1 both above and to its left.

64, 4021, 287802, 20148584, 1415755252, 99419347147, 6982256142285, 490358739919898, 34437619490245450, 2418533807739519677, 169852219543126318591, 11928622276532341733243, 837740183488415335215180

Offset

1,1

Comments

Column 7 of A184761

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 3X7
..0..1..0..1..0..1..0....0..0..1..0..0..1..1....0..1..0..1..1..0..0
..0..0..1..0..1..0..0....0..0..0..1..1..0..0....0..1..0..0..1..0..0
..0..1..0..0..1..0..1....1..0..0..0..1..1..0....0..0..0..0..0..1..1

Crossrefs

Sequence in context: A228984 A222385 A208268 * A324491 A107627 A017571

Adjacent sequences: A184756 A184757 A184758 * A184760 A184761 A184762

Keyword

nonn

Author

R. H. Hardin, Jan 21 2011

Status

approved