A188393 Number of (7*n) X n binary arrays with rows in nonincreasing order and 7 ones in every column.

1, 8, 410, 154279, 335279744, 3037611501499, 85864898797026630, 6108049486793195602061, 940799711096710781211340486, 282034644651263093966900548272466, 152112222253533154849862379093617650250, 138939503191252353429488898422015410111981523

Offset

1,2

Links

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

Example

All solutions for 14 X 2:
..1..1....1..0....1..1....1..1....1..1....1..1....1..1....1..1
..1..1....1..0....1..1....1..0....1..1....1..1....1..1....1..1
..1..1....1..0....1..1....1..0....1..0....1..1....1..1....1..1
..1..1....1..0....1..1....1..0....1..0....1..1....1..0....1..1
..1..1....1..0....1..0....1..0....1..0....1..1....1..0....1..1
..1..1....1..0....1..0....1..0....1..0....1..1....1..0....1..0
..1..1....1..0....1..0....1..0....1..0....1..0....1..0....1..0
..0..0....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..0..0....0..1....0..1....0..1....0..1....0..0....0..1....0..1
..0..0....0..1....0..1....0..1....0..1....0..0....0..1....0..0
..0..0....0..1....0..0....0..1....0..1....0..0....0..1....0..0
..0..0....0..1....0..0....0..1....0..1....0..0....0..0....0..0
..0..0....0..1....0..0....0..1....0..0....0..0....0..0....0..0
..0..0....0..1....0..0....0..0....0..0....0..0....0..0....0..0

Crossrefs

Row 7 of A188392.

Sequence in context: A015091 A008274 A188422 * A267162 A193372 A368002

Adjacent sequences: A188390 A188391 A188392 * A188394 A188395 A188396

Keyword

nonn

Author

R. H. Hardin, Mar 30 2011

Extensions

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

Status

approved