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A271654 a(n)=Sum_{k|n} binomial(n-1,k-1) 0
1, 2, 2, 5, 2, 17, 2, 44, 30, 137, 2, 695, 2, 1731, 1094, 6907, 2, 30653, 2, 97244, 38952, 352739, 2, 1632933, 10628, 5200327, 1562602, 20357264, 2, 87716708, 2, 303174298, 64512738, 1166803145, 1391282, 4978661179, 2, 17672631939, 2707475853, 69150651910, 2, 286754260229, 2, 1053966829029, 115133177854, 4116715363847, 2, 16892899722499, 12271514, 63207357886437 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..50.

PROG

(PARI) a(n)=sumdiv(n, k, binomial(n-1, k-1))

CROSSREFS

Cf. A056045.

Sequence in context: A144943 A114976 A085483 * A271622 A324505 A226135

Adjacent sequences:  A271651 A271652 A271653 * A271655 A271656 A271657

KEYWORD

nonn

AUTHOR

Franklin T. Adams-Watters, Apr 11 2016

STATUS

approved

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Last modified November 17 06:06 EST 2019. Contains 329217 sequences. (Running on oeis4.)