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A057209
n!^n *sum_{k=1 to n}[1/k^k].
0
1, 5, 278, 428304, 32130762624, 179894129302241280, 106668496974258140007628800, 9019586503563988003191559481720832000, 140893104069588516796205865279187670636282511360000
OFFSET
1,2
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
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Sep 17 2000
STATUS
approved