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A266433
Number of 7Xn binary arrays with rows and columns lexicographically nondecreasing and column sums nondecreasing.
1
8, 70, 826, 12758, 223075, 3825307, 59155748, 798834778, 9379683461, 96481143688, 879275711012, 7183343579974, 53182973236784, 360298764101463, 2252503422916387, 13090825673375302, 71176326297105679, 364068218093477268
OFFSET
1,1
COMMENTS
Row 7 of A266428.
FORMULA
Empirical polynomial of degree 57 (see link above)
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..1
..0..0..1..1....0..0..0..0....0..1..0..1....0..0..1..1....0..0..0..1
..0..0..1..1....0..0..0..1....0..1..1..0....0..0..1..1....0..0..0..1
..0..1..0..1....0..0..0..1....0..1..1..1....0..1..0..0....0..1..1..0
..0..1..0..1....0..0..0..1....1..0..0..0....0..1..0..1....0..1..1..0
..1..0..1..1....0..1..1..0....1..0..1..0....0..1..0..1....1..0..0..1
..1..1..0..0....0..1..1..0....1..1..0..1....1..0..1..0....1..0..1..1
CROSSREFS
Cf. A266428.
Sequence in context: A322416 A287482 A053729 * A267244 A228388 A020532
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2015
STATUS
approved