A165711 a(n) = Sum_{k=1..n} k!^k!.

1, 5, 46661, 1333735776850284124449081472890437

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, Sep 24 2009

Keywords

• nonn

Comments

The next term has 250 digits. - Harvey P. Dale, Dec 19 2014

Crossrefs

Cf. A165710.

Programs

Mathematica

s=0;lst={};Do[AppendTo[lst,s+=n!^n! ],{n,1,6,1}];lst
Accumulate[Table[(k!)^k!,{k,5}]] (* Harvey P. Dale, Dec 19 2014 *)

PARI

a(n)=sum(k=1,n,k!^k!) \\ Charles R Greathouse IV, Oct 12 2009