A188421 Number of (6*n)Xn binary arrays with rows in nonincreasing order, 6 ones in every column and no more than 3 ones in any row

1, 7, 256, 36659, 15083334, 14100262412, 25784105550034

Offset

1,2

Comments

Row 6 of A188416

Links

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

Example

All solutions for 12X2
..1..1....1..1....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..1....1..0....1..0....1..0....1..1....1..1
..1..1....1..1....1..0....1..0....1..0....1..1....1..0
..1..1....1..1....1..0....1..0....1..0....1..0....1..0
..1..1....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..0....0..0....0..1....0..1....0..1....0..1....0..1
..0..0....0..0....0..1....0..1....0..1....0..0....0..1
..0..0....0..0....0..1....0..1....0..1....0..0....0..0
..0..0....0..0....0..0....0..1....0..1....0..0....0..0
..0..0....0..0....0..0....0..0....0..1....0..0....0..0

Crossrefs

Sequence in context: A366866 A228291 A119942 * A165437 A232304 A254127

Adjacent sequences: A188418 A188419 A188420 * A188422 A188423 A188424

Keyword

nonn

Author

R. H. Hardin Mar 30 2011

Status

approved