%I #18 Nov 11 2012 14:53:55

%S 1,-1,-1,-1,4,39,-158,211,-186,-33722,55130,192039,-4032991

%N The value of the Mertens function at n^n.

%D Marc Deleglise and Joel Rivat, Computing the summation of the Mobius function, Experiment. Math. 5 (1996), no. 4, 291-295.

%F a(n) = A002321(n^n).

%t Table[Sum[MoebiusMu[k], {k, n^n}], {n, 7}]

%Y Cf. A002321, A000312, A084237.

%K sign,more

%O 1,5

%A _Carl Najafi_, Dec 04 2011

%E a(9)-a(10) from _Max Alekseyev_, Dec 10 2011

%E a(11) from _Donovan Johnson_, Jun 21 2012

%E a(12)-a(13) from _Rikard Nordgren_, Nov 10 2012