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 A006993 M4684 #26 Nov 08 2017 19:31:16
%S A006993 1,10,20,120,440,3200,20460,116600,612700,3628800
%N A006993 n! in base n.
%D A006993 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A006993 L. J. Upton, <a href="/A006993/a006993_1.pdf">Letter to N. J. A. Sloane with attachments, Oct. 1993</a>
%H A006993 R. G. Wilson v, <a href="/A006993/a006993.pdf">Letter to N. J. A. Sloane, n.d.</a>
%H A006993 <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a>
%p A006993 convert(n!,base,n);
%t A006993 Join[{1},Table[FromDigits[IntegerDigits[n!,n]],{n,2,10}]] (* _Harvey P. Dale_, Aug 21 2017 *)
%K A006993 nonn,base,fini,full
%O A006993 1,2
%A A006993 _N. J. A. Sloane_, L. J. Upton
%E A006993 Next term has a non-decimal digit.