A055591 a(n) = a(n-1)+3^a(n-1).
0, 1, 4, 85, 35917545547686059365808220080151141317128
Offset: 0
Examples
a(3) = 4+3^4 = 4+81 = 85
Programs
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Mathematica
NestList[#+3^#&,0,4] (* Harvey P. Dale, Apr 18 2012 *)
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
a(3) = 4+3^4 = 4+81 = 85
NestList[#+3^#&,0,4] (* Harvey P. Dale, Apr 18 2012 *)