Dirichlet convolution of phi(n) with Bell numbers.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =19a(5) =58a(6) =209a(7) =888a(8) =4150a(9) =21170a(10) =115985a(11) =678642a(12) =4213609a(13) =27644652a(14) =190899368a(15) =1382959444a(16) =10480142163a(17) =82864874064a(18) =682076806177