A250986 Number of (n+1)X(n+1) 0..2 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction

40, 872, 21955, 590305, 16381510, 469255626, 13747683580, 414063800414, 12788596731195

Offset

1,1

Comments

Diagonal of A250994

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A250584 A004421 A247411 * A190825 A054340 A271030

Adjacent sequences: A250983 A250984 A250985 * A250987 A250988 A250989

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved