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 A145499 #4 Sep 14 2015 17:57:36 %S A145499 1,2,3,6,30,120,840,3360,13440,134400,739200,6652800,86486400, %T A145499 778377600,16345929600,81729648000,1389404016000,12504636144000, %U A145499 79196028912000,1267136462592000,81096733605888000,3649353012264960000 %N A145499 Partial sums of A156832. %C A145499 a(n) is the largest divisor of n! such that a(n) - a(n-1) also divides n!. %K A145499 nonn %O A145499 1,2 %A A145499 _Franklin T. Adams-Watters_, Feb 17 2009