A228505 Number of nX7 binary arrays with top left value 1 and no two ones adjacent horizontally, vertically, diagonally or antidiagonally.

13, 43, 684, 4749, 49101, 413786, 3862849, 34229311, 311423874, 2795565191, 25267110999, 227577191098, 2053397764249, 18510745379063, 166945846438154, 1505305762277273, 13574575402532525, 122405516285033798

Offset: 1

Author

R. H. Hardin Aug 23 2013

Keywords

• nonn

Comments

Column 7 of A228506

Examples

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

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +50*a(n-2) -171*a(n-3) -514*a(n-4) +1800*a(n-5) +845*a(n-6) -5430*a(n-7) +704*a(n-8) +6175*a(n-9) -1762*a(n-10) -2810*a(n-11) +870*a(n-12) +392*a(n-13) -120*a(n-14)