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 A079691 #15 Aug 08 2023 10:32:44
%S A079691 0,0,0,1,0,0,0,0,0,1,1,1,1,1,0,2,0,2,1,1,2,0,2,3,2,0,4,3,2,3,3,2,5,3,
%T A079691 4,7,2,3,5,2,3,6,5,6,5,8,4,7,6,6,9,5,8,7,3,9,6,7,4,6,8,6,6,11,6,8,8,
%U A079691 11,6,4,11,11,10,6,5,9,8,9,8,11,10,8,11,12,13,9,11,7,12,15,15,17,8,11,16,11
%N A079691 Number of 6's in n!.
%H A079691 Seiichi Manyama, <a href="/A079691/b079691.txt">Table of n, a(n) for n = 0..10000</a>
%H A079691 <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a>.
%F A079691 a(n) = A034886(n) - (A027869(n) + A079680(n) + A079714(n) + A079684(n) + A079688(n) + A079690(n) + A079692(n) + A079693(n) + A079694(n)). - _Reinhard Zumkeller_, Jan 27 2008
%t A079691 Table[DigitCount[n!,10,6],{n,0,100}] (* _Harvey P. Dale_, Aug 08 2023 *)
%Y A079691 Cf. A079714.
%Y A079691 Cf. A000142, A137579, A137580.
%K A079691 easy,nonn,base
%O A079691 0,16
%A A079691 _Cino Hilliard_, Jan 31 2003