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A158143 Number of nondecreasing integer sequences of length 9 with sum zero and sum of absolute values 2n. 1
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; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A000041(n)^2 for n<=4

a(n) = A000041(n)^2 - cumulative A000712(2*n-1-length), 0 <= 2*n-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 A244557 A063482

Adjacent sequences:  A158140 A158141 A158142 * A158144 A158145 A158146

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2009

STATUS

approved

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Last modified August 9 05:12 EDT 2020. Contains 336319 sequences. (Running on oeis4.)