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

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =25a(5) =79a(6) =268a(7) =931a(8) =3340a(9) =12221a(10) =45525a(11) =171932a(12) =657002a(13) =2535167a(14) =9864727a(15) =38663036a(16) =152491244a(17) =604788048a(18) =2410462518a(19) =9649584165a(20) =38782437824a(21) =156428161276a(22) =633003302363