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

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =14a(6) =42a(7) =133a(8) =440a(9) =1510a(10) =5347a(11) =19459a(12) =72561a(13) =276616a(14) =1076236a(15) =4268236a(16) =17238623a(17) =70858091a(18) =296293158a(19) =1260044245a(20) =5449129205a(21) =23962691920a(22) =107160352895a(23) =487379459886