G.f. A(x) satisfies: A(x) = Sum_{n>=0} x^n/(1 - x*A(x)^n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =16a(5) =52a(6) =189a(7) =740a(8) =3067a(9) =13330a(10) =60366a(11) =283504a(12) =1376000a(13) =6884364a(14) =35440060a(15) =187471028a(16) =1018049493a(17) =5671511886a(18) =32396788157a(19) =189673021414