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A266463
Number of n X n binary arrays with rows and columns lexicographically nondecreasing and column sums nonincreasing.
0
2, 4, 12, 66, 735, 18808, 1231170, 223521350, 119000455681, 193166954325425, 983670413713595700
OFFSET
1,1
COMMENTS
Diagonal of A266470.
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..1..1....0..0..0..1....0..0..0..0....0..1..1..1
..0..0..1..1....1..1..0..1....0..1..1..0....0..0..0..1....1..0..0..1
..1..1..0..0....1..1..1..0....1..0..0..0....0..0..1..0....1..0..1..0
..1..1..1..1....1..1..1..0....1..1..1..1....1..1..0..0....1..1..0..0
CROSSREFS
Cf. A266470.
Sequence in context: A137160 A217716 A129824 * A013207 A172165 A078919
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2015
STATUS
approved