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 A138286 #5 Nov 26 2021 17:47:21 %S A138286 1,1,1,2,6,60,120,640,3780,90720,362880,6652800,39916800,1037836800, %T A138286 10897286400,53137244160,1307674368000,33345696384000,355687428096000, %U A138286 10137091700736000,202741834014720000,5109094217170944000,51090942171709440000,1641397888183173120000,16157510461803110400000 %N A138286 a(n) = A058162(n) / A000688(n). %Y A138286 Cf. A058162, A000688. %K A138286 nonn %O A138286 1,4 %A A138286 _Artur Jasinski_, Mar 12 2008 %E A138286 a(16) corrected by and a(22) onwards from _Georg Fischer_, Nov 26 2021