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 A139330 #15 Jul 10 2019 01:48:06 %S A139330 4,14,20,22,28,30,32,33,35,36,37,38,40,43,45,49,51,52,54,57,58,65,66, %T A139330 71,73,75,76,78,81,87,93,94,96,100,101,102,103,107,114,120,129,130, %U A139330 131,133,134,139,147,150,153,155,159,163,167,173,176,181,183,184,185 %N A139330 A-numbers of sequences in the OEIS not beginning with a 1. %H A139330 Nathaniel Johnston, <a href="/A139330/b139330.txt">Table of n, a(n) for n = 1..1000</a> (as of Sep 27 2011) %e A139330 a(3)=20 because the third sequence not begining with a "1" is A000020. %K A139330 dumb,easy,nonn %O A139330 1,1 %A A139330 _Leonardo Sznajder_, Jun 05 2008