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a(1) = 1, for n >= 2: a(n) = (a(n-1)-1)^n - 1.
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%I #4 Mar 30 2012 19:00:24

%S 1,-1,-9,9999,99900039992000799967

%N a(1) = 1, for n >= 2: a(n) = (a(n-1)-1)^n - 1.

%C a(6) has 120 digits.

%e For n = 4: a(4) = (-9-1)^4 - 1 = 9999.

%K sign

%O 1,3

%A _Jaroslav Krizek_, Nov 03 2010