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 A030975 #6 Aug 17 2019 14:17:20 %S A030975 1,2,7,30,154,924,6471,51771,465947,4659471,51254185,615050229, %T A030975 7995652977,111939141684,1679087125263,26865394004209,456711698071557, %U A030975 8220810565288034,156195400740472660,3123908014809453215 %N A030975 [ exp(1/4)*n! ]. %t A030975 Floor[Exp[1/4]Range[30]!] (* _Harvey P. Dale_, Aug 17 2019 *) %K A030975 nonn %O A030975 1,2 %A A030975 _Simon Plouffe_