A079286 (3^n)! - (2^n)!.

0, 4, 362856, 10888869450418352160767959680

Offset

0,2

Comments

Sum_{n>0} 1/a(n) = 0.25000275591...

The next term (a(4)) has 121 digits. - Harvey P. Dale, Jan 10 2024

Links

Table of n, a(n) for n=0..3.

Mathematica

Table[(3^n)!-(2^n)!, {n, 0, 4}]] (* Harvey P. Dale, Jan 10 2024 *)

Prog

(PARI) atonfact(a, n) = {sr=0; for(x=1, n, y =(a^x)!-((a-1)^x)!; sr+=1.0/y; print1(y" "); ); print(); print(sr) }

Crossrefs

Sequence in context: A260614 A300286 A058430 * A275685 A124119 A090096

Adjacent sequences: A079283 A079284 A079285 * A079287 A079288 A079289

Keyword

easy,nonn

Author

Cino Hilliard, Feb 08 2003

Extensions

Next term is too large to include.

Status

approved