A250763 Number of (n+1)X(n+1) 0..1 arrays with nondecreasing 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

9, 34, 114, 350, 996, 2666, 6810, 16798, 40368, 95114, 220710, 505982, 1148556, 2585674, 5779890, 12840638, 28371816, 62384042

Offset

1,1

Comments

Diagonal of A250769

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Sequence in context: A268803 A250652 A005344 * A264678 A050478 A204426

Adjacent sequences: A250760 A250761 A250762 * A250764 A250765 A250766

Keyword

nonn

Author

R. H. Hardin, Nov 27 2014

Status

approved