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

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =9a(5) =25a(6) =78a(7) =235a(8) =734a(9) =2355a(10) =7637a(11) =25096a(12) =83394a(13) =279563a(14) =944559a(15) =3213254a(16) =10996236a(17) =37829956a(18) =130759164a(19) =453879479a(20) =1581472334a(21) =5529435704a(22) =19393856909a(23) =68217376618a(24) =240586328527a(25) =850553637256