A228665 Number of 6Xn binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.

32, 70, 2348, 11912, 203762, 1482892, 19236832, 166237206, 1899605260, 17848767224, 192044287042, 1879682471996, 19647967583440, 196172283670342, 2022115572124828, 20385597248657864, 208716533500704978

Offset

1,1

Comments

Row 6 of A228660

Links

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

Formula

Empirical: a(n) = 4*a(n-1) +88*a(n-2) -138*a(n-3) -1388*a(n-4) +1332*a(n-5) +5911*a(n-6) -2920*a(n-7) -8340*a(n-8) +816*a(n-9) +2232*a(n-10)

Example

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

Crossrefs

Sequence in context: A264589 A100017 A135110 * A101539 A106700 A250755

Adjacent sequences: A228662 A228663 A228664 * A228666 A228667 A228668

Keyword

nonn

Author

R. H. Hardin Aug 29 2013

Status

approved