G.f. A(x) satisfies: A(x) = x * Product_{k>=1} (1 + k*A(x^k)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =19a(5) =45a(6) =110a(7) =259a(8) =614a(9) =1466a(10) =3479a(11) =8239a(12) =19581a(13) =46445a(14) =110209a(15) =261555a(16) =620649a(17) =1472597a(18) =3494663a(19) =8292514a(20) =19677729a(21) =46694303a(22) =110804310a(23) =262932172a(24) =623928374a(25) =1480555791a(26) =3513297447a(27) =8336903884a(28) =19783134767a(29) =46944538382