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A188419
Number of (4*n) X n binary arrays with rows in nonincreasing order, four 1's in every column and no more than three 1's in any row.
0
1, 5, 81, 3217, 252493, 33313408, 6720357785, 1943505834628, 768799728447441
OFFSET
1,2
COMMENTS
Row 4 of A188416.
EXAMPLE
All solutions for 8 X 2
..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
Cf. A188416.
Sequence in context: A009733 A009756 A336807 * A009634 A165435 A197443
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2011
STATUS
approved