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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 Table of n, a(n) for n=1..11. 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 Adjacent sequences: A213952 A213953 A213954 * A213956 A213957 A213958 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.)