A250624 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 min(x(i,j),x(i-1,j)) in the j direction

36, 654, 12151, 218680, 3719562, 60472234, 955747123, 14889326715, 230970404064, 3587145429658, 55929692397584, 876066561716430, 13782992949010087, 217673186775645105, 3448480940949820204

Offset

1,1

Comments

Diagonal of A250632

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=3
..0..0..0..0....1..0..0..2....0..0..0..1....0..0..2..1....0..0..0..1
..0..0..0..1....0..1..1..2....0..0..0..1....0..1..1..2....1..0..0..1
..0..0..1..1....0..1..1..2....0..0..1..2....0..1..2..2....0..1..1..2
..2..2..0..2....1..2..2..2....2..2..2..1....0..2..2..2....1..1..2..1

Crossrefs

Sequence in context: A283630 A035713 A035478 * A368062 A231767 A278277

Adjacent sequences: A250621 A250622 A250623 * A250625 A250626 A250627

Keyword

nonn

Author

R. H. Hardin, Nov 26 2014

Status

approved