E.g.f.: A(x) = exp( Sum_{n>=1} sigma(n) * a(n-1)*x^n/n! ) = Sum_{n>=0} a(n)*x^n/n! with a(0)=1.
A156306
E.g.f.: A(x) = exp( Sum_{n>=1} sigma(n) * a(n-1)*x^n/n! ) = Sum_{n>=0} a(n)*x^n/n! with a(0)=1.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =26a(4) =292a(5) =3468a(6) =69664a(7) =1208936a(8) =32822456a(9) =858979216a(10) =28933584112a(11) =836115182512
External references
- oeis: A156306