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 A256399 #7 May 05 2022 15:02:36 %S A256399 1,1,3,1,3,3,1,3,8,3,5,4,3,1,4,10,1,4,4,4,4,7,4,9,3,1,4,3,4,16,4,4,4, %T A256399 8,1,8,7,1,8,4,4,8,3,4,4,8,16,1,3,1,11,1,4,12,7,5,3,1,8,3,5,19,4,1,3, %U A256399 16,5,11,1,4,4,11,5,7 %N A256399 First differences of A256219. %H A256399 Rémy Sigrist, <a href="/A256399/b256399.txt">Table of n, a(n) for n = 1..10000</a> %Y A256399 Cf. A121216, A256219. %K A256399 nonn %O A256399 1,3 %A A256399 _N. J. A. Sloane_, Mar 28 2015