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 A262376 #31 Oct 06 2015 08:27:55
%S A262376 1,1,1,4,24,139,853,5886,46198,409069,4037859,43954648,522956236,
%T A262376 6749977023,93928268209,1401602636194,22324392524178,378011820620161,
%U A262376 6780385526348143,128425485935180124,2561327494111820104,53652269665821260083,1177652997443428940061
%N A262376 a(n) = Sum_{k=0..n} (k! - k).
%H A262376 Daniel Suteu, <a href="/A262376/b262376.txt">Table of n, a(n) for n = 0..100</a>
%F A262376 a(n) = Sum_{k=0..n} k! - k.
%F A262376 a(n) = A003422(n+1) - A000217(n). - _Altug Alkan_, Sep 20 2015
%e A262376 a(3) = 4, which is the following sum: (0!-0) + (1!-1) + (2!-2) + (3!-3).
%t A262376 Table[Sum[k! - k, {k, 0, n}], {n, 0, 22}] (* _Michael De Vlieger_, Sep 21 2015 *)
%o A262376 (Sidef)
%o A262376 var sum = 0;
%o A262376 range(0, 10).each { |n|
%o A262376 sum += (n! - n);
%o A262376 say(n, "\t", sum);
%o A262376 };
%o A262376 (PARI) a(n)=sum(i=0,n,i!-i) \\ _Anders Hellström_, Sep 20 2015
%Y A262376 Partial sums of A005096.
%Y A262376 Cf. A003422, A000217.
%K A262376 nonn,easy
%O A262376 0,4
%A A262376 _Daniel Suteu_, Sep 20 2015