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 A110379 #7 Sep 03 2017 03:31:05
%S A110379 1,5,31,217,1737,15634,156341,1719751,20637013,268281169,3755936367,
%T A110379 56339045506,901424728097,15324220377649,275835966797683,
%U A110379 5240883369155977,104817667383119541,2201171015045510362
%N A110379 a(n) = Sum_{composite c <= n} n!/c!.
%e A110379 a(6) = 6!(1/4! + 1/6!) = 31.
%p A110379 a:=proc(n) local s,i :s:=0: for i from 4 to n do if isprime(i)=false then s:=s+1/i! else s:=s: fi od: n!*s; end; seq(a(n),n=4..24); # _Emeric Deutsch_, Jul 25 2005
%Y A110379 Cf. A038048, A110373, A110374, A110376, A110377, A110378.
%K A110379 easy,nonn
%O A110379 4,2
%A A110379 _Amarnath Murthy_, Jul 24 2005
%E A110379 More terms from _Emeric Deutsch_, Jul 25 2005