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 A025146 #5 Jan 09 2024 16:11:41 %S A025146 1,1,1,2,2,2,1,1,1,1,1,1,2,2,1,1,1,0,0,0,1,1,1,0,0,0,-1,0,1,0,1,1,0,0, %T A025146 0,-1,0,1,0,1,1,0,1,1,0,1,1,1,2,1,0,1,0,0,1,0,0,1,0,0,1,1,0,1,1,1,2,1, %U A025146 1,1,0,0,0,0,0,1,0,0,1,0,1,1,0,1,2,1,1,2,1,0,1,1,1,2,1,1,1,0,0,0,0,0,1,1,1,2,1,0,1,0 %N A025146 (#1's in s(1),...,s(n)) - (#1's in r(1),...,r(n)), where s = A025142 and r = A025143. %H A025146 H. Harborth, <a href="https://doi.org/10.1007/s005910050025">Probleme und Lösungen</a>, Mathematische Semesterberichte 44 (1997) 94. %K A025146 sign %O A025146 1,4 %A A025146 _Clark Kimberling_