A188421 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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