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 A103520 #6 Aug 23 2014 11:13:14
%S A103520 1,6,504,65813284680,
%T A103520 1234718152224069224489356305213161520251951242625962440
%N A103520 a(1) = 1, a(n) = product of n successive numbers starting with a(n-1) + 1.
%C A103520 a(6) has 325 digits and a(7) has 2272 digits. - _Harvey P. Dale_, Aug 23 2014
%F A103520 a(n+1) = !{a(n)+n +1}/!{a(n)}
%e A103520 a(2) = 2*3 = 6, a(3) = 7*8*9 = 504.
%t A103520 nxt[{n_,a_}]:={n+1,Times@@Range[a+1,a+1+n]}; Transpose[NestList[nxt,{1,1},5]][[2]] (* _Harvey P. Dale_, Aug 23 2014 *)
%Y A103520 Cf. A103519.
%K A103520 easy,nonn
%O A103520 1,2
%A A103520 _Amarnath Murthy_, Feb 10 2005
%E A103520 More terms from _Olaf Voß_, Feb 26 2005. (The next term is too large to include.)