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A141008 E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=12. 2

%I

%S 1,6,64,930,16780,356922,8681380,236739354,7135453180,235079261562,

%T 8389974421012,322019941283514,13211434169884204,576435716324437722,

%U 26631611751773999044,1297943388416061780186

%N E.g.f. exp(sum_{d|M} (exp(d*x)-1)/d), M=12.

%H Vincenzo Librandi, <a href="/A141008/b141008.txt">Table of n, a(n) for n = 0..200</a>

%t 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, 12], {n, 0, 30}] (* _Vincenzo Librandi_, Dec 12 2012 *)

%Y Column k=12 of A162663.

%K nonn

%O 0,2

%A _R. J. Mathar_, Jul 11 2008

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Last modified November 28 06:42 EST 2021. Contains 349401 sequences. (Running on oeis4.)