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A188418 Number of (3*n)Xn binary arrays with rows in nonincreasing order, 3 ones in every column and no more than 3 ones in any row 0
1, 4, 39, 723, 21965, 968230, 57967660, 4505774905, 439923593145, 52601045792520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 3 of A188416

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

All solutions for 6X2

..1..0....1..1....1..1....1..1

..1..0....1..1....1..0....1..1

..1..0....1..0....1..0....1..1

..0..1....0..1....0..1....0..0

..0..1....0..0....0..1....0..0

..0..1....0..0....0..0....0..0

CROSSREFS

Sequence in context: A132612 A129463 A299426 * A136653 A165434 A348118

Adjacent sequences:  A188415 A188416 A188417 * A188419 A188420 A188421

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2011

STATUS

approved

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Last modified May 21 19:42 EDT 2022. Contains 353929 sequences. (Running on oeis4.)