%I #4 Mar 30 2012 19:00:24
%S 1,-1,3,7,1295,3628034278016223
%N a(1) = 1, for n >= 2: a(n) = (a(n-1)-1)^(n-1) - 1.
%C a(7) has 94 digits.
%e For n = 5: a(5) = (7-1)^4 - 1 = 1295.
%K sign
%O 1,3
%A _Jaroslav Krizek_, Nov 03 2010