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 A306215 #24 Feb 08 2019 05:38:02 %S A306215 1,2,3,5,8,13,22,37,61,100,162,260,416,663,1053,1664,2617,4102,6416, %T A306215 10029,15684,24561,38531,60560,95334,150238,236878,373449,588441, %U A306215 926449,1457335,2290726,3599062,5654352,8886976,13979961,22020411,34743031,54922083 %N A306215 a(n) gives the length of A306211 after n generations. %C A306215 n | A306211 after n generations %C A306215 --+----------------------------- %C A306215 1 | [1] %C A306215 2 | [1, 1] %C A306215 3 | [1, 1, 2] %C A306215 4 | [1, 1, 2, 2, 1] %C A306215 5 | [1, 1, 2, 2, 1, 2, 2, 1] %C A306215 6 | [1, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 1] %C A306215 7 | [1, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 1, 2, 2, 1, 2, 1, 2, 1, 1, 1] %H A306215 Benjamin Chaffin, <a href="/A306215/b306215.txt">Table of n, a(n) for n = 1..65</a> %Y A306215 Cf. A306211. %Y A306215 See A323475 for first differences. %K A306215 nonn %O A306215 1,2 %A A306215 _Peter Kagey_, Jan 29 2019 %E A306215 a(27)-a(39) from _Rémy Sigrist_, Jan 29 2019