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A213955 Number of n X n 0..1 matrices with row and column i=1..n having sum <= i. 0
2, 10, 138, 5314, 575122, 176041978, 153143689594, 380082566144530, 2699632942815871042, 55016905649245690586122, 3223966155402204759824471786 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..0....1..0..0..0....1..0..0..0....1..0..0..0....1..0..0..0
..0..0..1..1....0..1..1..0....0..1..0..0....0..1..0..0....0..0..0..0
..1..0..0..1....0..1..0..1....0..0..1..1....0..1..1..0....0..1..1..1
..0..1..1..1....0..0..1..0....0..1..0..0....0..0..1..1....0..0..1..1
CROSSREFS
Column 1 of A213962.
Sequence in context: A087417 A270589 A171214 * A091990 A014228 A059475
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 28 2012
STATUS
approved

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Last modified February 24 22:04 EST 2024. Contains 370307 sequences. (Running on oeis4.)