A250652 Number of (n+1)X(n+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction

9, 34, 109, 316, 859, 2234, 5625, 13816, 33271, 78838, 184309, 425972, 974835, 2211826, 4980721, 11141104, 24772591, 54788078, 120586221, 264241132, 576716779, 1254096874, 2717908969, 5872025576, 12650020839, 27179089894

Offset

1,1

Comments

Diagonal of A250656

Links

R. H. Hardin, Table of n, a(n) for n = 1..69

Example

Some solutions for n=4
..0..0..0..0..0....1..1..0..0..0....1..1..1..1..0....1..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..1..1..1..1....0..0..0..0..0....1..1..1..1..1
..0..0..0..0..0....0..1..1..1..1....0..0..0..0..0....0..0..1..1..1
..0..0..1..1..1....0..1..1..1..1....0..1..1..1..1....0..0..1..1..1

Crossrefs

Sequence in context: A067989 A002881 A268803 * A005344 A250763 A264678

Adjacent sequences: A250649 A250650 A250651 * A250653 A250654 A250655

Keyword

nonn

Author

R. H. Hardin, Nov 26 2014

Status

approved