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A188389 Number of (5*n) X 5 binary arrays with rows in nonincreasing order and n ones in every column. 2
52, 1750, 35775, 507549, 5442547, 46757209, 335279744, 2067951459, 11224133015, 54571222450, 241058398756, 978630346891, 3686088206746, 12983700750813, 43054563334197, 135177521790982, 403818954811225, 1152699706324158 (list; graph; refs; listen; history; text; internal format)
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 A215595 A134552

Adjacent sequences:  A188386 A188387 A188388 * A188390 A188391 A188392

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 30 2011

STATUS

approved

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)