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%I #16 Jan 16 2022 00:58:15
%S 1,1,7,3367,281192547174175,
%T 1766847064778382532572997586311708102647654387270579226645978663441513375
%N a(n) = 4^(n!) - 3^(n!).
%C a(6) has 434 digits.
%F a(n) = 4^(n!) - 3^(n!) = A101407(n) - A100731(n).
%e a(3) = 4^(3!) - 3^(3!) = 4^6 - 3^6 = 3367.
%t 4^#-3^#&/@(Range[0,5]!) (* _Harvey P. Dale_, Nov 26 2016 *)
%o (PARI) a(n) = 4^(n!) - 3^(n!); \\ _Michel Marcus_, Jan 23 2014
%Y Cf. A175985, A203925.
%Y Cf. A100731, A101407.
%K nonn
%O 0,3
%A _Assoul Abdelkarim_, Jan 23 2014
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