A250908 Number of (n+1)X(3+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element.

4909, 297873, 18077319, 1096982379, 66566704705, 4039362762435, 245114118899485, 14873861407326111, 902566310928490467, 54768961329136851033, 3323455667098397402917, 201671846608424737679469

Offset: 1

Author

R. H. Hardin, Nov 28 2014

Keywords

• nonn

Comments

Column 3 of A250913

Examples

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

Links

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

Formula

Empirical: a(n) = 74*a(n-1) -825*a(n-2) +1101*a(n-3) -4926*a(n-4) +231*a(n-5) +1684*a(n-6) +736*a(n-7)