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