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 A344406 #6 May 17 2021 04:04:43 %S A344406 2,4,5,7,8,9,12,13,14,16,18,19,22,23,26,27,29,31,33,35,38,39,42,43,46, %T A344406 48,50,52,54,60,61,64,65,68,72,77,79,85,89,93,96,123,157,183 %N A344406 List of numbers that are not the number of subtrees of some caterpillar. %C A344406 This list contains all of A184164, and the following additional numbers of subtrees which don't occur in caterpillars but do occur in other types of trees: 48, 61, 64, 79, 85, 93, 96, 123, 157, 183. %H A344406 É. Czabarka, L. Székely, and S. Wagner, <a href="https://doi.org/10.1016/j.dam.2009.07.004">The inverse problem for certain tree parameters</a>, Discrete Applied Mathematics, volume 157, 2009, pages 3314-3319, list at end of section 3. %H A344406 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CaterpillarGraph.html">Caterpillar Graph</a>. %Y A344406 Cf. A184164 (all trees). %K A344406 nonn,fini,full %O A344406 1,1 %A A344406 _Kevin Ryde_, May 17 2021