A144167 - OEIS

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A144167

IntegerPart(PolyGamma(n,1)).

1, -2, 6, -24, 122, -726, 5060, -40400, 363240, -3630593, 39926622, -479060379, 6227402193, -87180957830, 1307694352218, -20922949679481, 355688785859223, -6402385922818921, 121645216453639396, -2432903168507861321

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OFFSET

1,2

COMMENTS

Also equals (-1)^(n+1)*floor(n!*zeta(n+1)). [Jean-François Alcover, Feb 28 2013]

LINKS

Table of n, a(n) for n=1..20.

MATHEMATICA

lst={}; Do[AppendTo[lst, IntegerPart[PolyGamma[n, 1]]], {n, 4^3}]; lst

CROSSREFS

Sequence in context: A349089 A352429 A352437 * A104983 A375458 A144251

Adjacent sequences: A144164 A144165 A144166 * A144168 A144169 A144170

KEYWORD

sign

AUTHOR

Vladimir Joseph Stephan Orlovsky, Sep 12 2008

STATUS

approved