A251244 Number of (n+1)X(3+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements.

5139, 327753, 20904689, 1333268433, 85032883789, 5423196612609, 345878548314469, 22059307525808241, 1406889917539387453, 89728076602595409057, 5722642281407762900517, 364976447934805630538193

Offset: 1

Author

R. H. Hardin, Dec 01 2014

Keywords

• nonn

Comments

Column 3 of A251249

Examples

			Some solutions for n=1
..2..1..1..2....1..2..2..0....2..2..0..0....0..2..2..1....0..2..2..0
..0..2..0..2....0..0..0..1....1..0..0..2....1..2..0..2....0..1..2..2
		

Links

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

Formula

Empirical: a(n) = 81*a(n-1) -1165*a(n-2) +4257*a(n-3) -544*a(n-4) -4428*a(n-5) +7512*a(n-6) -80352*a(n-7) -67376*a(n-8) +32256*a(n-9) +20160*a(n-10)