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 A323989 #5 Jul 09 2025 04:48:37 %S A323989 1,2,1,0,1,2,0,1,0,2,1,2,0,2,1,0,1,2,1,0,2,1,2,0,1,2,1,0,1,2,0,2,1,0, %T A323989 2,0,1,2,1,0,1,2,0,1,0,2,1,0,1,2,0,2,1,2,0,1,0,2,0,1,2,0,2,1,0,1,2,1, %U A323989 0,2,0,1,2,0,2,1,0,2,0,1,0,2,1,2,0,2,1,0,2,0,1,2,1,0,1,2,0,2,1,2,0,1,2,1,0,2 %N A323989 Partial alternating sums modulo 3 of the Kolakoski sequence A000002. %C A323989 A074272 modulo 3. %Y A323989 Cf. A000002, A074272. %K A323989 nonn %O A323989 1,2 %A A323989 _N. J. A. Sloane_, Feb 13 2019, following a suggestion from Hannibal Fortune