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 A072487 #2 Dec 05 2013 19:55:20 %S A072487 1,2,6,12,60,180,1260,5040,15120,75600,831600,4989600,64864800, %T A072487 454053600,2270268000,18162144000,308756448000,2778808032000, %U A072487 52797352608000,527973526080000,3695814682560000,40653961508160000 %N A072487 a(1) = 1, a(n) = a(n-1) times largest nontrivial divisor if n is composite. %C A072487 a(n) = n*a(n-1) if n is a prime. %e A072487 a(6)= 180 hence a(7) = 7*180 = 1260. %Y A072487 Cf. A072486. %K A072487 nonn %O A072487 1,2 %A A072487 _Amarnath Murthy_, Jul 13 2002 %E A072487 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 25 2003