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a(n) = floor(a(n-1) * exp(Pi)), starting 0, 1.
0

%I #13 Dec 25 2013 11:48:18

%S 0,1,23,532,12310,284861,6591880,152540668,3529896712,81684254837,

%T 1890230234120,43741236852957,1012202517391875,23423067337090791,

%U 542026001764509598,12542857105806790317,290250401022346296890

%N a(n) = floor(a(n-1) * exp(Pi)), starting 0, 1.

%t a[0] = 0; a[1] = 1; a[2] = Floor[Exp[Pi]]; a[n_] := a[n] = Floor[a[n - 1]*Exp[Pi]] out1 = Table[a[n], {n, 0, 20}]

%t With[{c=Exp[Pi]},Join[{0},NestList[Floor[c #]&,1,20]]] (* _Harvey P. Dale_, Jan 04 2012 *)

%o (PARI) a(n)=if(n<2,1,floor(a(n-1)*exp(Pi))) \\ _Ralf Stephan_, Dec 25 2013

%K nonn

%O 0,3

%A _Roger L. Bagula_, Apr 04 2008

%E Clarified name and edited by _Ralf Stephan_, Dec 25 2013