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.
%I A117882 #10 Apr 11 2021 04:08:26
%S A117882 1,4,13,44,141,447,1408,4428,13916,43725,137373,431577,1355846,
%T A117882 4259523,13381694,42039839,132072059,414916622,1303499025,4095062974,
%U A117882 12865019770,40416651612,126972655803,398896362696,1253169882609
%N A117882 Partial sums of floor(Pi^n).
%C A117882 The only prime in the sequence through a(50) is a(2) = 13.
%F A117882 a(n) = Sum_{i=0..n} A001672(i).
%F A117882 a(n) = Sum_{i=0..n} floor(Pi^i).
%t A117882 Accumulate[Table[Floor[\[Pi]^n],{n,0,30}]] (* _Harvey P. Dale_, Apr 21 2011 *)
%Y A117882 Cf. A001672.
%K A117882 easy,nonn
%O A117882 0,2
%A A117882 _Jonathan Vos Post_, May 02 2006