id:A140921 - OEIS Search Results

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Number of 6 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 6,9,n can be permuted, see formula.

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1, 5005, 5725720, 2530768240, 559299781040, 72261531710368, 6062460972064640, 356031798904887040, 15480536486999030720, 520384188062967417280 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`(empirical) set p,q,r to n,9,6 (in any order) in s=p+q+r-1; a(n) = product {i in 0..r-1} (binomial(s,p+i)*i!/(s-i)^(r-i-1))`
	CROSSREFS	`Sequence in context: A018188 A067226 A138637 this_sequence A112139 A111030 A068378` `Adjacent sequences: A140918 A140919 A140920 this_sequence A140922 A140923 A140924`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin rhh(at)cadence.com, Jul 05 2008`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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