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 A001698 #16 Dec 19 2016 01:21:32
%S A001698 1,3,7,16,40,99,249,622,1559,3907,9793,24547,61529,154231,386598,
%T A001698 969057,2429064,6088761,15262259,38256810,95895601,240374624,
%U A001698 602529829,1510318306,3785806568,9489609785,23786924201,59624976769,149457652642,374634777973
%N A001698 a(n) = ceiling(sqrt( 2*Pi )^n).
%H A001698 T. D. Noe, <a href="/A001698/b001698.txt">Table of n, a(n) for n = 0..500</a>
%t A001698 Table[Ceiling[Sqrt[2Pi]^n], {n, 0, 50}] (* _Stefan Steinerberger_, Apr 14 2006 *)
%K A001698 nonn
%O A001698 0,2
%A A001698 _N. J. A. Sloane_