A250699 Number of (n+1)X(n+1) 0..3 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

100, 4958, 301632, 19962956, 1325146542, 85271480338, 5300798582250, 321304832475298, 19214828391609706, 1144064129571045403, 68214697806201152135, 4084627265006830276517

Offset

1,1

Comments

Diagonal of A250707

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A117685 A091134 A017816 * A035745 A035810 A017763

Adjacent sequences: A250696 A250697 A250698 * A250700 A250701 A250702

Keyword

nonn

Author

R. H. Hardin, Nov 26 2014

Status

approved