G.f.: A(x) = exp( Sum_{n>=1} A179305(n)*x^n/n ), where A179305(n) = Sum_{d|n} C(n,d)*sigma(d).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =14a(5) =20a(6) =61a(7) =85a(8) =254a(9) =395a(10) =1015a(11) =1521a(12) =4796a(13) =6763a(14) =18194a(15) =28909a(16) =80482a(17) =119001a(18) =340613a(19) =503813a(20) =1425101a(21) =2189198a(22) =5742800a(23) =8764203a(24) =25918633a(25) =38046941a(26) =101831753a(27) =159565629a(28) =435242037a(29) =656987672