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 A135003 #15 Jul 18 2021 03:32:52
%S A135003 1,1,0,3,6,3,8,3,2,3,5,1,4,3,2,6,9,6,4,7,8,6,5,7,1,3,1,0,4,8,4,3,8,2,
%T A135003 6,0,2,3,3,7,4,3,3,3,9,3,0,9,5,3,0,3,5,0,3,5,2,3,5,1,0,4,0,5,0,9,2,3,
%U A135003 8,4,4,8,7,2,3,4,6,9,9,4,1,0,0,7,1,4,4,1,8,2,3,0,3,7,7,5,8,9,3,1,2,3,9,8,8
%N A135003 Decimal expansion of 3/e.
%H A135003 G. C. Greubel, <a href="/A135003/b135003.txt">Table of n, a(n) for n = 1..2000</a>
%F A135003 Equals Sum_{n>=0} 1/A165457(n). - _Jaume Oliver Lafont_, Oct 03 2009
%F A135003 Equals 3/A001113 and 3*A068985. - _Michel Marcus_, Sep 16 2016
%F A135003 Equals 1 - Integral_{x=-1/e..0} W(x) dx, where W is Lambert's function. - _Amiram Eldar_, Jul 18 2021
%e A135003 1.103638323514...
%t A135003 RealDigits[3/E , 10, 50][[1]] (* _G. C. Greubel_, Sep 16 2016 *)
%o A135003 (PARI) 3/exp(1) \\ _Michel Marcus_, Sep 16 2016
%Y A135003 Cf. A001113, A068985, A165457.
%K A135003 cons,nonn
%O A135003 1,4
%A A135003 _Omar E. Pol_, Nov 15 2007
%E A135003 Minor edits by _Omar E. Pol_, Oct 07 2009