A188389 Number of (5*n) X 5 binary arrays with rows in nonincreasing order and n ones in every column.

52, 1750, 35775, 507549, 5442547, 46757209, 335279744, 2067951459, 11224133015, 54571222450, 241058398756, 978630346891, 3686088206746, 12983700750813, 43054563334197, 135177521790982, 403818954811225, 1152699706324158

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for 10 X 5:
..1..0..0..0..1....1..1..0..1..0....1..1..1..1..1....1..1..0..0..0
..1..0..0..0..0....1..0..0..1..0....1..0..1..0..0....1..1..0..0..0
..0..1..0..1..1....0..1..0..0..0....0..1..0..0..0....0..0..1..1..1
..0..1..0..0..0....0..0..1..0..0....0..0..0..1..0....0..0..1..1..0
..0..0..1..0..0....0..0..1..0..0....0..0..0..0..1....0..0..0..0..1
..0..0..1..0..0....0..0..0..0..1....0..0..0..0..0....0..0..0..0..0
..0..0..0..1..0....0..0..0..0..1....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0

Crossrefs

Column 5 of A188392.

Sequence in context: A275102 A004342 A230530 * A169997 A342898 A215595

Adjacent sequences: A188386 A188387 A188388 * A188390 A188391 A188392

Keyword

nonn

Author

R. H. Hardin, Mar 30 2011

Status

approved