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A029807 a(n) = (1/(8*n)) * Sum_{d|n} mu(n/d) * binomial(2*d,d)^3. 0
1, 13, 333, 10712, 400075, 16435017, 721861385, 33308540000, 1596292110000, 78832566399375, 3989172320345245, 205979496842877048, 10817872108002076923, 576440295110730997877, 31102930647624990624975 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

PROG

(PARI) a(n) = sumdiv(n, d, moebius(n/d)*binomial(2*d, d)^3)/(8*n) \\ Michel Marcus, Jun 15 2013

CROSSREFS

Sequence in context: A142543 A258297 A266902 * A097308 A204195 A238652

Adjacent sequences:  A029804 A029805 A029806 * A029808 A029809 A029810

KEYWORD

nonn

AUTHOR

Lionel Levine (levine(AT)ultranet.com)

EXTENSIONS

More terms from Erich Friedman

STATUS

approved

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Last modified January 18 17:18 EST 2022. Contains 350455 sequences. (Running on oeis4.)