G.f.: exp( Sum_{n>=1} (x^n/n) / Product_{d|n} (1 - d*x^(n/d))^d ).
A205486
G.f.: exp( Sum_{n>=1} (x^n/n) / Product_{d|n} (1 - d*x^(n/d))^d ).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =60a(6) =259a(7) =1273a(8) =7048a(9) =43241a(10) =289685a(11) =2097912a(12) =16317134a(13) =135574160a(14) =1196898329a(15) =11168544771a(16) =109647222799
External references
- oeis: A205486