A188390 Number of (6*n) X 6 binary arrays with rows in nonincreasing order and n ones in every column.

203, 29388, 2406208, 127126912, 4762077620, 135029200594, 3037611501499, 56145844958803, 875963221085790, 11783651978066917, 139046229227207511, 1459663879628065055, 13793467053380688310, 118506173536216683338

Offset

1,1

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for 12 X 6:
..1..1..0..0..0..1....1..1..0..1..1..0....1..1..0..0..1..0....1..1..0..0..0..1
..1..0..1..0..1..0....1..0..0..0..0..0....1..0..0..0..0..0....1..0..1..1..1..0
..0..1..0..1..1..0....0..1..1..0..0..1....0..1..1..0..0..0....0..1..0..0..0..0
..0..0..1..0..0..1....0..0..1..0..0..1....0..0..1..0..1..0....0..0..1..0..0..0
..0..0..0..1..0..0....0..0..0..1..1..0....0..0..0..1..0..1....0..0..0..1..0..0
..0..0..0..0..0..0....0..0..0..0..0..0....0..0..0..1..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..0..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0

Crossrefs

Column 6 of A188392.

Sequence in context: A255946 A273656 A331129 * A209742 A209463 A209525

Adjacent sequences: A188387 A188388 A188389 * A188391 A188392 A188393

Keyword

nonn

Author

R. H. Hardin, Mar 30 2011

Extensions

a(10)-a(14) from Andrew Howroyd, May 18 2020

Status

approved