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 A066877 #7 Oct 03 2019 05:02:43
%S A066877 0,0,1,1,2,1,1,2,2,2,4,1,2,1,4,2,3,3,3,2,4,3,2,2,3,2,2,4,5,1,3,1,1,2,
%T A066877 3,2,5,1,4,2,4,4,7,4,5,5,2,4,3,2,5,5,4,6,6,5,6,5,2,3,4,4,5,4,6,4,7,2,
%U A066877 6,5,5,3,4,5,7,3,5,4,2,4,4,4,4,6,2,3,4
%N A066877 a(n) = omega(n!-1), where omega is the number of distinct primes dividing n, A001221.
%H A066877 Amiram Eldar, <a href="/A066877/b066877.txt">Table of n, a(n) for n = 1..135</a>
%H A066877 Hisanori Mishima, <a href="http://www.asahi-net.or.jp/~KC2H-MSM/mathland/matha1/matha105.htm">Appendix 1. Factorization results for n!-1</a>
%t A066877 Table[ Length[ FactorInteger[ n! - 1]], {n, 1, 30}]
%K A066877 hard,nonn
%O A066877 1,5
%A A066877 _Robert G. Wilson v_, Jan 21 2002
%E A066877 a(52) corrected and more terms added by _Amiram Eldar_, Oct 03 2019