a(1)=1; a(2)=2; for n>2, a(n) = a(n-1) + A000217(n-1)*a(n-2).
A166474
a(1)=1; a(2)=2; for n>2, a(n) = a(n-1) + A000217(n-1)*a(n-2).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =67a(5) =322a(6) =1729a(7) =10745a(8) =72989a(9) =556514a(10) =4570909a(11) =41300833a(12) =397831735a(13) =4156207538a(14) =45928539713a(15) =544673444273
External references
- oeis: A166474