A228682 Number of nX7 binary arrays with no two ones adjacent horizontally, diagonally or antidiagonally.

34, 508, 8832, 152048, 2644336, 46125216, 806190208, 14105294112, 246929287360, 4324094979072, 75733743499264, 1326545935320192, 23236786328620160, 407043788171511808, 7130373880883372800, 124906998542616448512

Offset: 1

Author

R. H. Hardin Aug 30 2013

Keywords

• nonn

Comments

Column 7 of A228683

Examples

			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
		

Links

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

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)