L.g.f.: Sum_{n>=1} x^n/n * Product_{d|n} (1 + d*x^n)^d.

Terms

a(0) =1a(1) =3a(2) =1a(3) =11a(4) =1a(5) =45a(6) =1a(7) =59a(8) =109a(9) =53a(10) =1a(11) =869a(12) =1a(13) =101a(14) =961a(15) =3643a(16) =1a(17) =3555a(18) =1a(19) =18101a(20) =3235a(21) =245a(22) =1a(23) =92645a(24) =21876a(25) =341a(26) =11287a(27) =74141a(28) =1a(29) =722045