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 A197220 #11 Jun 08 2017 18:44:44 %S A197220 3,34,37,71,108,179,1003,1182,12823,39651,369682,409333,1188348, %T A197220 28929685,4109203618,12356540539,16465744157,61753773010,263480836197, %U A197220 325234609207,2214888491439,2540123100646,14915503994669,32371131089984,79657766174637,112028897264621 %N A197220 Numerators of convergents to e + 1/e. %H A197220 Robert Israel, <a href="/A197220/b197220.txt">Table of n, a(n) for n = 1..1898</a> %p A197220 numtheory:-cfrac(exp(1)+exp(-1), 100, 'ccon'): %p A197220 map(numer, ccon[1..-2]); # _Robert Israel_, Jun 08 2017 %t A197220 Numerator[Convergents[E + 1/E, 40]] %Y A197220 Cf. A137204 (decimal), A197221 (denominators). %K A197220 nonn %O A197220 1,1 %A A197220 _T. D. Noe_, Oct 12 2011