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A141011 E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=15. 2
1, 4, 40, 612, 11976, 276836, 7336248, 219610532, 7331824360, 269576919908, 10796426089880, 466904884431268, 21658080409800264, 1071807203930733668, 56328256034260866296, 3131089417758323092388 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

MATHEMATICA

u[0, j_]: = 1; u[k_, j_]: = u[k, j] = Sum[Binomial[k-1, i-1]Plus@@(u[k-i, j]#^(i-1)&/@Divisors[j]), {i, k}]; Table[u[n, 15], {n, 0, 30}] (* Vincenzo Librandi, Dec 12 2012 *)

CROSSREFS

Column k=15 of A162663.

Sequence in context: A128573 A052675 A141010 * A090359 A049308 A227055

Adjacent sequences:  A141008 A141009 A141010 * A141012 A141013 A141014

KEYWORD

nonn

AUTHOR

R. J. Mathar, Jul 11 2008

STATUS

approved

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Last modified January 15 20:47 EST 2019. Contains 319184 sequences. (Running on oeis4.)