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Dirichlet convolution of 3^(n-1) with Bell numbers.
0

%I #5 Sep 10 2019 12:39:23

%S 1,4,11,35,96,310,932,3106,10719,40956,175024,856215,4745038,29240098,

%T 195682588,1397312405,10523188868,82994029902,682464226648,

%U 5833904550458,51727645023058,474880276916928,4506747119506932

%N Dirichlet convolution of 3^(n-1) with Bell numbers.

%t Table[Sum[BellB[n/d - 1]*3^(d - 1), {d, Divisors[n]}], {n, 1, 25}] (* _Vaclav Kotesovec_, Sep 10 2019 *)

%K nonn

%O 1,2

%A _Erich Friedman_