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A188417 Number of (2*n)Xn binary arrays with rows in nonincreasing order, 2 ones in every column and no more than 3 ones in any row 0
1, 3, 16, 124, 1308, 17443, 282349, 5396178, 119324602, 3005520274, 85152637884, 2685936442822, 93514176139534 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A188416

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

All solutions for 4X2

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

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

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

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

CROSSREFS

Sequence in context: A005119 A190291 A090135 * A157457 A000950 A320254

Adjacent sequences:  A188414 A188415 A188416 * A188418 A188419 A188420

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2011

STATUS

approved

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Last modified February 19 10:16 EST 2019. Contains 320310 sequences. (Running on oeis4.)