A250748 Number of (n+1)X(n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)+x(i-1,j) in the j direction

32, 237, 1353, 6663, 29814, 124785, 497471, 1911819, 7141428, 26081157, 93524517, 330341391, 1152105314, 3974940633, 13587035451, 46067386899, 155081690112, 518770438893, 1725559820033, 5710472045463, 18811007467662, 61706609086017

Offset

1,1

Comments

Diagonal of A250755

Links

R. H. Hardin, Table of n, a(n) for n = 1..53

Example

Some solutions for n=4
..0..0..0..0..0....2..2..2..2..2....1..1..0..0..0....2..2..2..2..2
..0..0..0..0..0....2..2..2..2..2....0..0..1..1..1....0..0..0..0..0
..1..1..2..2..2....2..2..2..2..2....0..0..1..1..1....0..0..1..1..1
..0..0..2..2..2....1..1..1..1..1....0..0..1..1..1....0..0..2..2..2
..0..0..2..2..2....0..0..2..2..2....1..1..2..2..2....0..0..2..2..2

Crossrefs

Sequence in context: A302085 A229400 A223250 * A333268 A060622 A118999

Adjacent sequences: A250745 A250746 A250747 * A250749 A250750 A250751

Keyword

nonn

Author

R. H. Hardin, Nov 27 2014

Status

approved