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 A001671 #17 May 28 2018 15:35:59
%S A001671 1,3,8,21,55,149,404,1097,2981,8104,22027,59875,162755,442414,1202605,
%T A001671 3269018,8886111,24154953,65659970,178482301,485165196,1318815735,
%U A001671 3584912847,9744803447,26489122130,72004899338,195729609429,532048240602,1446257064292,3931334297145,10686474581525
%N A001671 Powers of e rounded up.
%H A001671 T. D. Noe, <a href="/A001671/b001671.txt">Table of n, a(n) for n = 0..500</a>
%t A001671 Table[Ceiling[E^n], {n, 0, 50}] (* _T. D. Noe_, Aug 09 2012 *)
%o A001671 (PARI) apply( A001671(n)=exp(n)\1+!!n, [0..30]) \\ An error message will say so if default(realprecision) must be increased, for large n. - _M. F. Hasler_, May 27 2018
%Y A001671 Cf. A000149 (floor(e^n)), A000227 (round(e^n)).
%K A001671 nonn
%O A001671 0,2
%A A001671 _N. J. A. Sloane_