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

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =118a(6) =460a(7) =1844a(8) =7587a(9) =31804a(10) =135433a(11) =584092a(12) =2546250a(13) =11201310a(14) =49663816a(15) =221701658a(16) =995621590a(17) =4494862920a(18) =20388491423a(19) =92872814115a(20) =424665159560