A188422 Number of (7*n)Xn binary arrays with rows in nonincreasing order, 7 ones in every column and no more than 3 ones in any row

1, 8, 410, 101829, 87171345, 197263686098, 990154499577167

Offset

1,2

Comments

Row 7 of A188416

Links

Table of n, a(n) for n=1..7.

Example

All solutions for 14X2
..1..1....1..1....1..1....1..1....1..1....1..1....1..0....1..1
..1..1....1..1....1..0....1..1....1..1....1..1....1..0....1..1
..1..0....1..1....1..0....1..1....1..1....1..1....1..0....1..1
..1..0....1..1....1..0....1..1....1..1....1..0....1..0....1..1
..1..0....1..1....1..0....1..1....1..1....1..0....1..0....1..0
..1..0....1..0....1..0....1..1....1..1....1..0....1..0....1..0
..1..0....1..0....1..0....1..1....1..0....1..0....1..0....1..0
..0..1....0..1....0..1....0..0....0..1....0..1....0..1....0..1
..0..1....0..1....0..1....0..0....0..0....0..1....0..1....0..1
..0..1....0..0....0..1....0..0....0..0....0..1....0..1....0..1
..0..1....0..0....0..1....0..0....0..0....0..1....0..1....0..0
..0..1....0..0....0..1....0..0....0..0....0..0....0..1....0..0
..0..0....0..0....0..1....0..0....0..0....0..0....0..1....0..0
..0..0....0..0....0..0....0..0....0..0....0..0....0..1....0..0

Crossrefs

Sequence in context: A183579 A015091 A008274 * A188393 A267162 A193372

Adjacent sequences: A188419 A188420 A188421 * A188423 A188424 A188425

Keyword

nonn

Author

R. H. Hardin Mar 30 2011

Status

approved