A153826 Index sequence to A089840: positions of bijections that preserve A127301 (the non-oriented form of general trees).

0, 2, 22, 23, 24, 25, 26, 91, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 395, 531, 634, 876, 1005, 1109, 1228, 1229, 1230, 1231, 1232, 1704, 3608, 3611, 3613, 3615, 3617, 4392

Offset

0,2

Comments

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.

Links

A. Karttunen, Table of n, a(n) for n = 0..2129

A. Karttunen, C-program for computing the initial terms of this sequence

Crossrefs

Subset of A153827. Apart from 0, has no other terms in common with A153829. Cf. also A153828, A153830, A153831, A153832, A153833.

Sequence in context: A079032 A325485 A284063 * A080283 A228112 A080433

Adjacent sequences: A153823 A153824 A153825 * A153827 A153828 A153829

Keyword

nonn

Author

Antti Karttunen, Jan 07 2009

Status

approved