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 A153826 #7 Sep 26 2021 05:06:35 %S A153826 0,2,22,23,24,25,26,91,276,277,278,279,280,281,282,283,284,285,286, %T A153826 287,288,289,290,291,292,293,294,295,296,297,298,395,531,634,876,1005, %U A153826 1109,1228,1229,1230,1231,1232,1704,3608,3611,3613,3615,3617,4392 %N A153826 Index sequence to A089840: positions of bijections that preserve A127301 (the non-oriented form of general trees). %C A153826 These terms form a subgroup in A089840 (A089839). Because A127301 can be computed as a fold and most of the recursive derivations of A089840 (i.e., tables A122201-A122204, A122283-A122290, A130400-A130403) are also folds, this sequence also gives the indices to those derived tables where bijections preserving A127301 occur. %H A153826 A. Karttunen, <a href="/A153826/b153826.txt">Table of n, a(n) for n = 0..2129</a> %H A153826 A. Karttunen, <a href="/A089839/a089839.c.txt">C-program for computing the initial terms of this sequence</a> %Y A153826 Subset of A153827. Apart from 0, has no other terms in common with A153829. Cf. also A153828, A153830, A153831, A153832, A153833. %K A153826 nonn %O A153826 0,2 %A A153826 _Antti Karttunen_, Jan 07 2009