L.g.f.: Sum_{n>=1} a(n)*x^n/n = Sum_{n>=1} x^n/n * exp( Sum_{k>=1} 2*a(n*k)*x^(n*k)/k ).
A203265
L.g.f.: Sum_{n>=1} a(n)*x^n/n = Sum_{n>=1} x^n/n * exp( Sum_{k>=1} 2*a(n*k)*x^(n*k)/k ).
Terms
- a(0) =1a(1) =5a(2) =22a(3) =125a(4) =576a(5) =3554a(6) =16843a(7) =103917a(8) =521338a(9) =3189600a(10) =15813205a(11) =101516930a(12) =501568809a(13) =3154939135a(14) =16288999167a(15) =101770328205a(16) =513944896547
External references
- oeis: A203265