A250575 Number of (n+1) X (n+1) 0..1 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

10, 60, 336, 1776, 8914, 43202, 203560, 939730, 4266332, 19120668, 84774066, 372587962, 1625370614, 7046239064, 30380655534, 130376624746, 557189663232, 2372600434880, 10070044493366, 42616195500252, 179877106083440

Offset

1,1

Comments

Diagonal of A250583

Links

R. H. Hardin, Table of n, a(n) for n = 1..28

Example

Some solutions for n=6
..0..0..0..0..0..0..1....0..0..0..0..0..0..0....0..0..0..0..1..1..1
..0..0..0..0..0..0..1....0..0..0..0..0..0..0....0..0..0..0..1..1..1
..0..0..0..0..0..1..1....0..0..0..0..0..1..1....0..0..0..0..1..1..1
..0..0..0..0..1..1..1....0..1..1..1..1..1..1....0..0..0..0..1..1..1
..0..1..1..1..1..1..1....0..1..1..1..1..1..1....0..0..0..0..1..1..1
..0..1..1..1..1..1..1....1..1..1..1..1..1..1....0..0..0..0..1..1..1
..1..1..1..1..1..1..1....0..1..1..1..1..1..1....1..1..0..0..1..1..1

Crossrefs

Sequence in context: A293081 A292489 A083585 * A155633 A368525 A002493

Adjacent sequences: A250572 A250573 A250574 * A250576 A250577 A250578

Keyword

nonn

Author

R. H. Hardin, Nov 25 2014

Status

approved