A228654 Number of n X n binary arrays with top left value 1 and no two ones adjacent horizontally, diagonally or antidiagonally.

1, 2, 34, 416, 24109, 1482892, 337258048, 99770848656, 92600434253746, 128571982215641568, 497887042842429868023, 3189515020018986830642404, 52334113476786453501159739264, 1527284319716267796002249895255726

Offset: 1

Author

R. H. Hardin Aug 29 2013

Keywords

• nonn

Comments

Diagonal of A228660

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..29