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 A071424 #6 Oct 15 2013 22:31:23
%S A071424 1,2,3,5,8,11,15,20,26,33,41,50,60,71,84,98,113,129,147,166,186,208,
%T A071424 231,255,281,308,337,367,398,431,465,501,538,577,618,660,704,749,796,
%U A071424 844,894,946,999,1054,1111,1169,1229,1291,1354,1419,1486,1554,1624
%N A071424 a(n) = a(n-1) + number of decimal digits of n!. Number of decimal digits of concatenation of first n factorials.
%t A071424 Do[s=s+Length[IntegerDigits[n! ]]; Print[s], {n, 1, 128}]
%Y A071424 Cf. A058183.
%K A071424 easy,nonn,base
%O A071424 1,2
%A A071424 _Labos Elemer_, May 27 2002