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 A005182 M1057 #25 Jun 26 2017 23:00:56 %S A005182 0,1,1,2,4,7,12,20,33,54,90,148,244,403,665,1096,1808,2980,4914,8103, %T A005182 13359,22026,36315,59874,98715,162754,268337,442413,729416,1202604, %U A005182 1982759,3269017,5389698,8886110,14650719,24154952,39824784 %N A005182 a(n) = floor(e^((n-1)/2)). %D A005182 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A005182 R. K. Guy and N. J. A. Sloane, <a href="/A005180/a005180.pdf">Correspondence</a>, 1988. %t A005182 Floor[E^((Range[0,40]-1)/2)] (* _Harvey P. Dale_, Mar 20 2016 *) %K A005182 nonn %O A005182 0,4 %A A005182 _N. J. A. Sloane_, _R. K. Guy_