A158143 - OEIS

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A158143

Number of nondecreasing integer sequences of length 9 with sum zero and sum of absolute values 2n.

1, 4, 9, 25, 48, 113, 189, 367, 598, 1031, 1559, 2566, 3681, 5593, 7926, 11480, 15598, 21984, 29080, 39672, 51688, 68384, 87284, 113869, 142723, 181944, 225921, 283427, 346610, 430023, 519663, 635875, 762786, 921749, 1094895, 1313500, 1545683 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`a(n) = A000041(n)^2 for n<=4` `a(n) = A000041(n)^2 - cumulative A000712(2n-1-length), 0 <= 2n-1-length <= floor(n/2) [empirical].`
	LINKS	`R. H. Hardin, Table of n, a(n) for n=1..643`
	CROSSREFS	`Sequence in context: A130448 A046451 A158142 * A082200 A063482 A069557` `Adjacent sequences: A158140 A158141 A158142 * A158144 A158145 A158146`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Mar 13 2009`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.