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A226510
Number of extended RNA secondary structures of size n according to the zu Siederdissen et al. (2011) model.
0
1, 1, 2, 6, 20, 66, 221, 757, 2647, 9402, 33813, 122876, 450543, 1664835, 6193553, 23178525, 87199503, 329592705, 1251029482, 4766563155, 18223733493, 69892469057, 268824143700, 1036690445777, 4007586822784
OFFSET
1,3
COMMENTS
It appears that "pseudoknot-free RNA secondary structures with base triples are a new combinatorial object and ... not bijective to any other combinatorial objects studied before". [Müller and Nebel]
LINKS
Christian Höner zu Siederdissen, Stephan H. Bernhart, Peter F. Stadler, Ivo L. Hofacker, A folding algorithm for extended RNA secondary structures, Bioinformatics, 27(13):129-136 (2011).
R. Müller and M. E. Nebel, Combinatorics of RNA secondary structures with base triples, preprint of Journal of Computational Biology, Jul 2015.619-648, 2013.
CROSSREFS
Sequence in context: A111285 A052991 A246019 * A108627 A193234 A285197
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 11 2013
STATUS
approved