A251220 Number of (n+1) X (n+1) 0..1 arrays with no 2 X 2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements.

14, 305, 20782, 4462968, 3007738372, 6373427948731, 42432102644410392, 887822645668106069016, 58374742677350528694024651, 12061621459257582136492647314788, 7831831916823870434473136772446378463

Offset: 1

Author

R. H. Hardin, Nov 30 2014

Keywords

• nonn

Comments

Diagonal of A251228.

Examples

			Some solutions for n=3
..1..0..0..1....1..0..1..0....1..1..0..0....0..1..1..0....1..1..1..0
..1..0..0..1....0..0..1..1....0..1..0..1....1..0..1..0....1..0..1..1
..0..0..0..1....0..0..0..0....0..1..1..1....1..1..1..1....0..0..0..1
..0..0..0..0....1..1..0..1....0..0..0..1....0..0..1..0....1..0..1..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15

Crossrefs

Cf. A251228.