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 A028913 #11 Jul 08 2025 18:55:41 %S A028913 1,2,2,4,2,6,4,8,4,8,6,10,2,18,4,20,6,10,14,18,4,20,18,18,4,26,18,16, %T A028913 8,40,8,30,12,30,16,24,12,44,12,30,30,42,10,26,24,46,14,48,22,38,30, %U A028913 48,12,60,12,52,14,54,52,26,12,66,54,60,10,26,60,60,10,74,30,52,56,64,14,34 %N A028913 First differences of A007952. %H A028913 R. Zumkeller, <a href="/A028913/b028913.txt">Table of n, a(n) for n = 0..1000</a> %Y A028913 Cf. A082447, A140060, A140061. %K A028913 nonn %O A028913 0,2 %A A028913 _N. J. A. Sloane_ %E A028913 More terms from _Reinhard Zumkeller_, Jun 21 2008