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a(n) = ceiling((Pi^n)*(e^n)).
3

%I #16 Jan 30 2017 20:50:17

%S 9,73,623,5319,45418,387853,3312154,28284913,241545634,2062735515,

%T 17615213066,150429237854,1284625710592,10970362144063,93683977036771,

%U 800036264817078,6832097070038331,58344293161634134,498244757010106386

%N a(n) = ceiling((Pi^n)*(e^n)).

%H Vincenzo Librandi, <a href="/A121246/b121246.txt">Table of n, a(n) for n = 1..1000</a>

%p A121246:=n->ceil((Pi^n)*(exp(1)^n)): seq(A121246(n), n=1..30); # _Wesley Ivan Hurt_, Jan 30 2017

%t Table[Ceiling[Pi^n E^n],{n,20}] (* _Harvey P. Dale_, Aug 20 2012 *)

%Y Cf. A019609, A062541.

%K nonn,easy,less

%O 1,1

%A _Mohammad K. Azarian_, Aug 22 2006