A064991 - OEIS

%I #5 Mar 29 2014 09:05:43

%S 0,1,78,20487601,369071811667060977001038,

%T 2157596228176369025492751451130809592490957353466093604326704974092869041

%N In A064990, drop leading 0's from A_k (for k>0) and convert to decimal.

%C Next term is about 4.31*10^218.

%F a(n+1) = a(n)(4^3^n + 2^3^n - 1) + 2^3^n - 1. - _David Wasserman_, Aug 20 2002

%K nonn,easy,base

%O 0,3

%A Michael Gilleland (megilleland(AT)yahoo.com), Oct 31 2001

%E More terms from _David Wasserman_, Aug 20 2002