G.f. A(x) equals an infinite symmetric composition of functions x+x^n, n=2,3,4,...

A163137

G.f. A(x) equals an infinite symmetric composition of functions x+x^n, n=2,3,4,...

Terms

    a(0) =1a(1) =2a(2) =4a(3) =13a(4) =39a(5) =113a(6) =359a(7) =1161a(8) =3708a(9) =11961a(10) =38903a(11) =126885a(12) =415509a(13) =1365935a(14) =4501009a(15) =14856863a(16) =49115474a(17) =162590020a(18) =538828790a(19) =1787431873a(20) =5934532485a(21) =19718347615a(22) =65559507987a(23) =218095336290a(24) =725890070743

External references