G.f.: exp( Sum_{n>=1} a(n)*x^n/n ) = Product_{n>=1} (1 + a(n-1)*x^n).
A157311
G.f.: exp( Sum_{n>=1} a(n)*x^n/n ) = Product_{n>=1} (1 + a(n-1)*x^n).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =13a(5) =66a(6) =394a(7) =2759a(8) =22005a(9) =198049a(10) =1979646a(11) =21776107a(12) =261287398a(13) =3396736175a(14) =47553219799a(15) =713298307974
External references
- oeis: A157311