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

1,1

Comments

Column 3 of A251249

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)

Example

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

Crossrefs

Sequence in context: A255779 A237206 A230575 * A188338 A213701 A224462

Adjacent sequences: A251241 A251242 A251243 * A251245 A251246 A251247

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved