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 A306274 #7 Feb 02 2019 06:33:46 %S A306274 1,1,1,2,3,5,8,14,22,36,59,96,156,253,410,666,1078,1744,2824,4569, %T A306274 7386,11942,19302,31188,50380,81376,131403,212166,342492,552811, %U A306274 892148,1439619,2322709,3747152,6044436,9749175,15723022,25355115,40884174,65918823,106274262 %N A306274 Number of unlabeled balanced rooted semi-identity trees with 2n-1 nodes and depth n. %H A306274 Alois P. Heinz, <a href="/A306274/b306274.txt">Table of n, a(n) for n = 1..400</a> %F A306274 a(n) = A306269(2n-1,n). %Y A306274 Cf. A306269. %K A306274 nonn %O A306274 1,4 %A A306274 _Alois P. Heinz_, Feb 02 2019