A184754 Half the number of n X n binary arrays with no 1 having an adjacent 1 both above and to its left

1, 7, 163, 12397, 3110914, 2568513843, 6982256142285, 62483420093901107, 1840782554883258104105, 178527915853668578288219231, 57000185549334885919706636039360, 59911857895558455825087768017439269698

Offset

1,2

Comments

Diagonal of A184761

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for 3X3
..1..1..0....1..1..1....1..1..0....1..0..1....1..0..1....0..0..1....0..1..1
..0..1..0....1..0..1....0..1..1....1..1..0....1..0..1....0..0..0....1..0..1
..0..1..0....1..1..0....1..0..0....0..0..0....1..0..0....1..1..0....0..0..0

Crossrefs

Sequence in context: A212856 A351610 A169608 * A160241 A020998 A012504

Adjacent sequences: A184751 A184752 A184753 * A184755 A184756 A184757

Keyword

nonn

Author

R. H. Hardin Jan 21 2011

Status

approved