A188452 Number of (4*n)Xn binary arrays with nonzero rows in decreasing order, no more than 3 ones in any row and exactly 4 ones in every column.

0, 0, 1, 139, 16683, 2876300, 703845255, 235994839738, 105035943170557

Offset

1,4

Comments

Row 4 of A188449

Links

Table of n, a(n) for n=1..9.

Example

All solutions for 12X3
..1..1..1
..1..1..0
..1..0..1
..1..0..0
..0..1..1
..0..1..0
..0..0..1
..0..0..0
..0..0..0
..0..0..0
..0..0..0
..0..0..0

Crossrefs

Sequence in context: A201174 A281249 A302089 * A183491 A215571 A108317

Adjacent sequences: A188449 A188450 A188451 * A188453 A188454 A188455

Keyword

nonn

Author

R. H. Hardin, Mar 31 2011

Status

approved