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A064991
In A064990, drop leading 0's from A_k (for k>0) and convert to decimal.
1
0, 1, 78, 20487601, 369071811667060977001038, 2157596228176369025492751451130809592490957353466093604326704974092869041
OFFSET
0,3
COMMENTS
Next term is about 4.31*10^218.
FORMULA
a(n+1) = a(n)(4^3^n + 2^3^n - 1) + 2^3^n - 1. - David Wasserman, Aug 20 2002
CROSSREFS
Sequence in context: A159402 A093239 A299713 * A265492 A051326 A033399
KEYWORD
nonn,easy,base
AUTHOR
Michael Gilleland (megilleland(AT)yahoo.com), Oct 31 2001
EXTENSIONS
More terms from David Wasserman, Aug 20 2002
STATUS
approved