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 A093468 #12 Jul 25 2015 01:10:24
%S A093468 1,2,3,6,18,78,438,2958,23118,204558,2018958,21977358,261478158,
%T A093468 3374988558,46964134158,700801318158,11162196262158,189005910310158,
%U A093468 3390192763174158,64212742967590158,1280663747055910158
%N A093468 a(1) = 1, a(2) = 2; for n >= 2, a(n+1) = a(n) + Sum {a(n)-a(i), i = 1 to n}.
%C A093468 Ignoring the different offsets, this is the partial sums of A001710. - _Jonathan Vos Post_ and _Franklin T. Adams-Watters_, May 12 2010
%F A093468 a(n) = A014288(n-1)+1. - _Vladeta Jovovic_, Apr 08 2004
%F A093468 a(n)=n*a(n-1)-(n-1)*a(n-2), n>3. - _Gary Detlefs_, Dec 30 2010
%t A093468 a[1] = 1; a[2] = 2; a[n_] := a[n] = a[n - 1] + Sum[a[n - 1] - a[i], {i, n - 1}]; Table[ a[n], {n, 21}] (* _Robert G. Wilson v_, Apr 08 2004 *)
%Y A093468 Cf. A093467.
%K A093468 nonn
%O A093468 1,2
%A A093468 _Amarnath Murthy_, Apr 07 2004
%E A093468 More terms from _Robert G. Wilson v_, Apr 08 2004