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 A079680 #12 Nov 01 2022 13:47:59 %S A079680 1,1,0,0,0,1,0,0,0,0,0,1,1,0,2,1,0,0,0,3,1,3,2,1,1,4,3,3,4,4,3,2,5,7, %T A079680 2,4,4,4,7,3,6,6,6,4,6,7,4,10,4,5,7,10,3,2,5,5,4,7,10,6,8,3,8,9,12,5, %U A079680 5,8,11,9,7,6,6,16,13,9,7,7,11,15,8,9,13,10,15,13,8,14,14,12,11,12,13,16,11 %N A079680 Number of 1's in n!. %H A079680 Seiichi Manyama, <a href="/A079680/b079680.txt">Table of n, a(n) for n = 0..10000</a> %H A079680 <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a>. %F A079680 a(n) = A034886(n) - (A027869(n) + A079714(n) + A079684(n) + A079688(n) + A079690(n) + A079691(n) + A079692(n) + A079693(n) + A079694(n)). - _Reinhard Zumkeller_, Jan 27 2008 %Y A079680 Cf. A000142, A137579, A137580. %K A079680 easy,nonn,base %O A079680 0,15 %A A079680 _Cino Hilliard_, Jan 31 2003