A228388 Number of nX6 binary arrays with top left value 1 and no two ones adjacent horizontally or vertically.

8, 70, 963, 11449, 143072, 1755243, 21683149, 267157140, 3294926929, 40621769739, 500881862476, 6175719012200, 76146337618146, 938873253971283, 11576206633106083, 142733217148402101, 1759883977929944820

Offset

1,1

Comments

Column 6 of A228390

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 8*a(n-1) +62*a(n-2) -78*a(n-3) -375*a(n-4) +300*a(n-5) +486*a(n-6) -385*a(n-7) -30*a(n-8) +52*a(n-9) -2*a(n-10) -a(n-11)

Example

Some solutions for n=4
..1..0..0..0..1..0....1..0..0..0..1..0....1..0..1..0..0..1....1..0..0..0..0..1
..0..0..0..1..0..0....0..0..0..1..0..1....0..0..0..0..1..0....0..1..0..1..0..0
..0..0..0..0..0..0....1..0..1..0..0..0....0..0..0..0..0..0....0..0..1..0..1..0
..1..0..0..0..0..0....0..0..0..1..0..1....1..0..0..1..0..0....0..0..0..1..0..1

Crossrefs

Sequence in context: A053729 A266433 A267244 * A020532 A043086 A003364

Adjacent sequences: A228385 A228386 A228387 * A228389 A228390 A228391

Keyword

nonn

Author

R. H. Hardin, Aug 21 2013

Status

approved