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 A167621 #17 Feb 24 2021 08:15:39 %S A167621 1,8,11,80,81,82,83,84,85,86,87,88,89,800,801,802,803,804,805,806,807, %T A167621 808,809,810,811,812,813,814,815,816,817,818,819,820,821,822,823,824, %U A167621 825,826,827,828,829,830,831,832,833,834,835,836,837,838,839,840 %N A167621 Numbers whose Spanish names begin with a vowel. %H A167621 Álvar Ibeas, <a href="/A167621/b167621.txt">Table of n, a(n) for n = 1..10000</a> %e A167621 Uno, Ocho, Once, Ochenta, etc. %Y A167621 Cf. A000852 (English), A118549 (Dutch), A118557 (French), A291663 (Danish). %K A167621 nonn,word %O A167621 1,2 %A A167621 _Claudio Meller_, Nov 07 2009 %E A167621 Missing term 800 added by _Álvar Ibeas_, Sep 18 2020