A250776 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, 46, 230, 1152, 5688, 27986, 137082, 670608, 3275574, 15987988, 77980390, 380145754, 1852275976, 9021572492, 43923360572, 213777365336

Offset

1,1

Comments

Diagonal of A250783

Links

Table of n, a(n) for n=1..16.

Example

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

Crossrefs

Sequence in context: A217152 A081193 A250722 * A054140 A307955 A110675

Adjacent sequences: A250773 A250774 A250775 * A250777 A250778 A250779

Keyword

nonn

Author

R. H. Hardin, Nov 27 2014

Status

approved