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 A001673 #12 Dec 19 2016 01:20:59 %S A001673 1,4,10,32,98,307,962,3021,9489,29810,93649,294205,924270,2903678, %T A001673 9122172,28658146,90032221,282844564,888582404,2791563950,8769956797, %U A001673 27551631843,86556004192,271923706894,854273519914,2683779414318,8431341691877,26487841119104 %N A001673 a(n) = ceiling(Pi^n). %H A001673 T. D. Noe, <a href="/A001673/b001673.txt">Table of n, a(n) for n = 0..300</a> %t A001673 Ceiling[Pi^Range[0,40]] (* _Harvey P. Dale_, May 08 2011 *) %K A001673 nonn %O A001673 0,2 %A A001673 _N. J. A. Sloane_