A188420 Number of (5*n)Xn binary arrays with rows in nonincreasing order, 5 ones in every column and no more than 3 ones in any row

1, 6, 150, 11712, 2181522, 793369090, 498407294632, 497114063711190

Offset

1,2

Comments

Row 5 of A188416

Links

Table of n, a(n) for n=1..8.

Example

All solutions for 10X2
..1..1....1..1....1..0....1..1....1..1....1..1
..1..1....1..1....1..0....1..0....1..1....1..1
..1..1....1..0....1..0....1..0....1..1....1..1
..1..0....1..0....1..0....1..0....1..1....1..1
..1..0....1..0....1..0....1..0....1..1....1..0
..0..1....0..1....0..1....0..1....0..0....0..1
..0..1....0..1....0..1....0..1....0..0....0..0
..0..0....0..1....0..1....0..1....0..0....0..0
..0..0....0..0....0..1....0..1....0..0....0..0
..0..0....0..0....0..1....0..0....0..0....0..0

Crossrefs

Sequence in context: A013301 A233734 A227044 * A089482 A126679 A232689

Adjacent sequences: A188417 A188418 A188419 * A188421 A188422 A188423

Keyword

nonn

Author

R. H. Hardin Mar 30 2011

Status

approved