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%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