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 A068094 #7 Dec 05 2013 19:55:10
%S A068094 3,10,31,96,306,967,3058,9670,30579,96700,305793,967000,3057922,
%T A068094 9670000,30579224,96699996,305792239,966999967,3057922393,9669999669,
%U A068094 30579223926,96699996687,305792239263,966999966873,3057922392627,9669999668731,30579223926265
%N A068094 Number of n-digit triangular numbers.
%F A068094 Differences of successive terms of A068092.
%t A068094 triInverse[n_] := Floor[(Sqrt[1 + 8*n] - 1)/2]; Differences[Table[triInverse[10^(n - 1) - 1], {n, 30}]] (* _T. D. Noe_, Jul 27 2012 *)
%Y A068094 Cf. A068092, A068093, A095863, A095864, A095865, A095866.
%K A068094 base,easy,nonn
%O A068094 1,1
%A A068094 _Amarnath Murthy_, Feb 19 2002
%E A068094 More terms from _Sascha Kurz_, Mar 06 2002