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

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =8a(5) =18a(6) =50a(7) =150a(8) =429a(9) =1258a(10) =3835a(11) =11740a(12) =36148a(13) =112856a(14) =355318a(15) =1124582a(16) =3582186a(17) =11477162a(18) =36939043a(19) =119387415a(20) =387393424a(21) =1261422550a(22) =4120343870a(23) =13498085604a(24) =44337516318a(25) =145993301239a(26) =481812344551