A251223 Number of (n+1)X(3+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements.

171, 1892, 20782, 228689, 2515011, 27662994, 304255924, 3346446223, 36806732398, 404828461391, 4452610577279, 48973192395914, 538644351143299, 5924419545393448, 65161264266944558, 716693058210959682

Offset: 1

Author

R. H. Hardin, Nov 30 2014

Keywords

• nonn

Comments

Column 3 of A251228

Examples

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

Links

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

Formula

Empirical: a(n) = 8*a(n-1) +39*a(n-2) -48*a(n-3) -210*a(n-4) +88*a(n-5) +260*a(n-6) -199*a(n-7) +36*a(n-8)