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 A158567 #5 Jun 19 2025 20:34:34 %S A158567 -1,0,-1,-6,4,1,0,-1,0,-1,4,-6,1,4,0,-1,0,-1,4,-6,1,0,-1,0,-1,4,-6,1, %T A158567 4,4,-6,1,4,-6,4,1,1,1,0,-1,0,-1,-6,4,1,0,-1,0,-1,4,-6,1,4,0,-1,0,-1, %U A158567 4,-6,1,0,-1,0,-1,4,-6,1,4,4,-6,1,4,-6,4,1,1,1,-9,9,0,-1,-6,4,1,0,-1,0,-1,4 %N A158567 First differences of A157680. %F A158567 a(n) = A157680(n+1)-A157680(n). %Y A158567 Cf. A157680, A157644. %K A158567 sign,base,less %O A158567 1,4 %A A158567 _Paul Curtz_, Mar 21 2009 %E A158567 Edited and extended by _R. J. Mathar_, Apr 08 2009