A251004 Number of (n+1)X(2+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than the absolute difference of its antidiagonal elements

530, 10743, 218298, 4434257, 90065275, 1829373498, 37157718881, 754736624943, 15329985552866, 311378109150967, 6324619621199857, 128463794143755317, 2609318408138865875, 52999700037507178758, 1076514156083681528652

Offset

1,1

Comments

Column 2 of A251010

Links

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

Formula

Empirical: a(n) = 27*a(n-1) -169*a(n-2) +800*a(n-3) -2847*a(n-4) +5874*a(n-5) -6458*a(n-6) +2876*a(n-7) +558*a(n-8) -1473*a(n-9) +1896*a(n-10) -1394*a(n-11) +460*a(n-12) -68*a(n-13)

Example

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

Crossrefs

Sequence in context: A158368 A250795 A031724 * A098259 A174761 A031967

Adjacent sequences: A251001 A251002 A251003 * A251005 A251006 A251007

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved