|
%I #7 Sep 11 2019 04:49:43
%S 1,3,4,10,16,52,134,446,1437,4896,16798,58896,208014,743170,2674476,
%T 9695727,35357672,129647751,477638702,1767272976,6564120692,
%U 24466300618,91482563642,343059732248,1289904147355,4861946817482
%N Dirichlet convolution of d(n) (# of divisors) with Catalan numbers.
%F a(n) ~ 2^(2*n-2) / (sqrt(Pi) * n^(3/2)). - _Vaclav Kotesovec_, Sep 11 2019
%t Table[Sum[CatalanNumber[n/d - 1]*DivisorSigma[0, d], {d, Divisors[n]}], {n, 1, 25}] (* _Vaclav Kotesovec_, Sep 10 2019 *)
%K nonn
%O 1,2
%A _Erich Friedman_
|
