id:A140919 - OEIS Search Results

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Number of 4 X 9 matrices with elements in 0..n with each row and each column in nondecreasing order. 4,9,n can be permuted, see formula.

+0
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1, 715, 143143, 13026013, 677352676, 23029990984, 559299781040, 10323075958624, 151561524301616, 1832516612010448, 18748054569029968, 165848175033726640, 1291064254877933536, 8973605947365856720, 56367818871058637800, 323286019995777481500 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`(empirical) set p,q,r to n,9,4 (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: A154042 A027809 A030537 this_sequence A151631 A034587 A111416` `Adjacent sequences: A140916 A140917 A140918 this_sequence A140920 A140921 A140922`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin rhh(at)cadence.com, Jul 05 2008`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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