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 A248875 #22 Feb 16 2025 08:33:23 %S A248875 0,1,5,17,52,157,473,1420,4262,12788,38365,115097,345293,1035880, %T A248875 3107641,9322925,27968776,83906329,251718989,755156969,2265470908, %U A248875 6796412726,20389238179,61167714538,183503143616,550509430849,1651528292549,4954584877649,14863754632948 %N A248875 First n elements of the Kolakoski sequence read as a ternary number. %H A248875 Danny Rorabaugh, <a href="/A248875/b248875.txt">Table of n, a(n) for n = 0..6615</a> %H A248875 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KolakoskiSequence.html">Kolakoski Sequence</a> %H A248875 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Ternary.html">Ternary</a> %F A248875 a(n+1) = 3*a(n) + A000002(n+1). %Y A248875 Cf. A000002, A019300. %K A248875 nonn,base,easy %O A248875 0,3 %A A248875 _Danny Rorabaugh_, Mar 04 2015