A250528 Number of (n+1)X(n+1) 0..3 arrays with nondecreasing max(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

110, 6012, 393910, 28135982, 2039109478, 147966207622, 10608507190002, 752883908026920, 52789559542083230, 3668155942062924886, 252635964025577748788

Offset

1,1

Comments

Diagonal of A250536

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A035836 A008395 A201213 * A251029 A111600 A111784

Adjacent sequences: A250525 A250526 A250527 * A250529 A250530 A250531

Keyword

nonn

Author

R. H. Hardin, Nov 24 2014

Status

approved