A064991 In A064990, drop leading 0's from A_k (for k>0) and convert to decimal.

0, 1, 78, 20487601, 369071811667060977001038, 2157596228176369025492751451130809592490957353466093604326704974092869041

Offset

0,3

Comments

Next term is about 4.31*10^218.

Links

Table of n, a(n) for n=0..5.

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

Adjacent sequences: A064988 A064989 A064990 * A064992 A064993 A064994

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