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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
OFFSET
1,2
COMMENTS
Row 2 of A188416
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: A190291 A090135 A351423 * A327826 A157457 A365626
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 30 2011
STATUS
approved