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 A020910 #8 Oct 19 2019 12:50:29 %S A020910 1,1,2,3,3,3,5,6,6,8,7,6,8,8,11,9,12,10,12,13,13,14,18,13,16,16,15,19, %T A020910 19,18,18,15,20,16,20,25,23,24,21,22,23,23,28,28,28,24,33,28,25,36,33, %U A020910 34,37,39,38,30,35,31,31,33,41,45,46,39,38,47,50,47,45,43,49,51,49,46,44,50,45 %N A020910 Number of terms in Zeckendorf representation of 3^n. %H A020910 Amiram Eldar, <a href="/A020910/b020910.txt">Table of n, a(n) for n = 0..1000</a> %Y A020910 Cf. A007895. %K A020910 nonn %O A020910 0,3 %A A020910 _Clark Kimberling_