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A188419 Number of (4*n)Xn binary arrays with rows in nonincreasing order, 4 ones in every column and no more than 3 ones in any row 0
1, 5, 81, 3217, 252493, 33313408, 6720357785, 1943505834628, 768799728447441 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A188416

LINKS

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

EXAMPLE

All solutions for 8X2

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A009733 A009756 A336807 * A009634 A165435 A197443

Adjacent sequences:  A188416 A188417 A188418 * A188420 A188421 A188422

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2011

STATUS

approved

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Last modified July 4 16:46 EDT 2022. Contains 355081 sequences. (Running on oeis4.)