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 A307558 #8 Apr 14 2019 17:25:45 %S A307558 1,2,1,3,3,3,3,3,3,1,3,3,3,3,3,3,4,3,3,3,3,3,7,3,3,3,3,3,7,3,3,3,3,3, %T A307558 10,3,3,3,3,10,3,3,3,13,3,3,3,13,3,3,3,16,3,3,16,3,3,16,3,3,16,3,3,16, %U A307558 3,3,16,3,3,16,3,3,16,3,3,19,3,19,3,3,16,3 %N A307558 First differences of A307518. %H A307558 Alois P. Heinz, <a href="/A307558/b307558.txt">Table of n, a(n) for n = 1..10000</a> %F A307558 a(n) = A307518(n+1) - A307518(n). %Y A307558 Cf. A307518. %K A307558 nonn %O A307558 1,2 %A A307558 _Alois P. Heinz_, Apr 14 2019