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

1,1

Comments

Column 3 of A250913

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)

Example

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

Crossrefs

Sequence in context: A168028 A031834 A031634 * A179144 A036530 A088069

Adjacent sequences: A250905 A250906 A250907 * A250909 A250910 A250911

Keyword

nonn

Author

R. H. Hardin, Nov 28 2014

Status

approved