A057209 n!^n *sum_{k=1 to n}[1/k^k].

1, 5, 278, 428304, 32130762624, 179894129302241280, 106668496974258140007628800, 9019586503563988003191559481720832000, 140893104069588516796205865279187670636282511360000

Offset

1,2

Links

Table of n, a(n) for n=1..9.

Example

a(3) = 3!^3 *(1 +1/2^2 +1/3^3) = 6^3 *(1 +1/4 +1/27) = 278.

Crossrefs

Sequence in context: A260197 A225781 A368754 * A216662 A203521 A276556

Adjacent sequences: A057206 A057207 A057208 * A057210 A057211 A057212

Keyword

easy,nonn

Author

Leroy Quet, Sep 17 2000

Status

approved