G.f. A(x) satisfies: 1 = Product_{n>=1} (1 - A(x)^n) * (1 - A(x)^n*x) * (1 - A(x)^(n-1)/x).
A268650
G.f. A(x) satisfies: 1 = Product_{n>=1} (1 - A(x)^n) * (1 - A(x)^n*x) * (1 - A(x)^(n-1)/x).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =12a(4) =50a(5) =228a(6) =1093a(7) =5439a(8) =27816a(9) =145310a(10) =772109a(11) =4159998a(12) =22674120a(13) =124800022a(14) =692686326a(15) =3872659052a(16) =21788990982a(17) =123280580325a(18) =700988359296
External references
- oeis: A268650