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 A030851 #12 Mar 21 2020 04:07:43 %S A030851 1,2,6,25,125,755,5285,42286,380578,3805780,41863584,502363009, %T A030851 6530719126,91430067771,1371451016567,21943216265073,373034676506249, %U A030851 6714624177112491,127577859365137340,2551557187302746813 %N A030851 a(n) = floor(exp(1/21) * n!). %t A030851 Floor[Exp[1/21] Range[20]!] (* _Harvey P. Dale_, Jan 22 2015 *) %Y A030851 Cf. A021025 (1/21). %K A030851 nonn,easy %O A030851 1,2 %A A030851 _Simon Plouffe_