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%I #5 Mar 30 2012 18:38:53
%S 1,1201,3461763601,57522274700204200328401,
%T 31764596032183221357775361004244057832177481618001,
%U 19372599572885568957165529710172832947035894754619777993470030014145668169574231766337989087612412837201
%N a(n)=(7^(2^n)-1)/2^(n+2)/150.
%K easy,nonn
%O 2,2
%A _Benoit Cloitre_, Mar 22 2002