id:A140913 - OEIS Search Results

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Number of 4 X 8 matrices with elements in 0..n with each row and each column in nondecreasing order. 4,8,n can be permuted, see formula.

+0
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1, 495, 70785, 4723719, 184225041, 4789851066, 90474964580, 1318349483880, 15484613937936, 151561524301616, 1268665346776464, 9271015995674160, 60142744792450320, 351141102288229176, 1866359220145419780, 9118323640906544350, 41286527321442170625 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`(empirical) set p,q,r to n,8,4 (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: A027808 A104478 A133352 this_sequence A157447 A109477 A110847` `Adjacent sequences: A140910 A140911 A140912 this_sequence A140914 A140915 A140916`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin rhh(at)cadence.com, Jul 05 2008`

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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.

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