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A228682
Number of nX7 binary arrays with no two ones adjacent horizontally, diagonally or antidiagonally.
1
34, 508, 8832, 152048, 2644336, 46125216, 806190208, 14105294112, 246929287360, 4324094979072, 75733743499264, 1326545935320192, 23236786328620160, 407043788171511808, 7130373880883372800, 124906998542616448512
OFFSET
1,1
COMMENTS
Column 7 of A228683
LINKS
FORMULA
Empirical: a(n) = 30*a(n-1) -226*a(n-2) -108*a(n-3) +4324*a(n-4) -1612*a(n-5) -27016*a(n-6) -2240*a(n-7) +50112*a(n-8) +20032*a(n-9) -16768*a(n-10) -4864*a(n-11) +2048*a(n-12)
EXAMPLE
Some solutions for n=4
..0..0..1..0..1..0..0....0..0..0..0..1..0..0....0..0..1..0..0..0..0
..1..0..0..0..0..0..1....0..0..1..0..1..0..0....1..0..0..0..1..0..1
..1..0..1..0..0..0..1....0..0..1..0..0..0..0....1..0..1..0..1..0..0
..1..0..0..0..0..0..1....1..0..1..0..0..0..1....1..0..1..0..0..0..1
CROSSREFS
Sequence in context: A302383 A303104 A066291 * A020929 A160279 A230332
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 30 2013
STATUS
approved