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A188391 Number of (7*n) X 7 binary arrays with rows in nonincreasing order and n ones in every column. 1
877, 624889, 238773109, 55643064708, 8738543204786, 992649275638900, 85864898797026630, 5878897478976883089, 328290088245117576091, 15312799057782368782624, 608266461487720680703265, 20908600183730320082374280 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for 14 X 7:

..1..0..0..0..0..0..0....1..0..0..0..1..0..1....1..0..0..1..0..0..1

..1..0..0..0..0..0..0....1..0..0..0..1..0..0....1..0..0..0..0..0..0

..0..1..1..0..0..0..0....0..1..0..1..0..0..0....0..1..0..0..0..0..0

..0..1..0..0..0..0..1....0..1..0..0..0..0..0....0..1..0..0..0..0..0

..0..0..1..0..0..0..1....0..0..1..1..0..1..0....0..0..1..1..0..0..1

..0..0..0..1..1..1..0....0..0..1..0..0..0..0....0..0..1..0..0..0..0

..0..0..0..1..0..0..0....0..0..0..0..0..1..0....0..0..0..0..1..1..0

..0..0..0..0..1..1..0....0..0..0..0..0..0..1....0..0..0..0..1..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..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 7 of A188392.

Sequence in context: A255947 A048791 A273657 * A209464 A209526 A208307

Adjacent sequences: A188388 A188389 A188390 * A188392 A188393 A188394

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 30 2011

EXTENSIONS

a(7)-a(12) from Andrew Howroyd, May 17 2020

STATUS

approved

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Last modified November 27 12:40 EST 2022. Contains 358405 sequences. (Running on oeis4.)