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A068338
n!^2 * sum{k=1 to n} mu(k)/k^2, where mu(k) is the Moebius function.
0
1, 3, 23, 368, 8624, 324864, 15399936, 985595904, 79833268224, 8115008716800, 968747865292800, 139499692602163200, 23346005516963020800, 4614592869368384716800, 1045883450064438558720000
OFFSET
1,2
CROSSREFS
Sequence in context: A363577 A260509 A073588 * A255881 A243195 A233218
KEYWORD
nonn
AUTHOR
Leroy Quet, Feb 27 2002
STATUS
approved