A140639 Number of 4-noncrossing RNA structures with arc-length => 4.

1, 1, 1, 1, 2, 5, 15, 51, 179, 647, 2397, 9081, 35181, 139307, 563218

Offset

1,5

Comments

Table 2, p. 30 of Han and Reidys. See diagrams p. 31. Combinatorial formulas and asymptotic results are also given.

Links

Table of n, a(n) for n=1..15.

Hillary S. W. Han, Christian M. Reidys, Pseudoknot RNA structures with arc-length => 4

Crossrefs

Cf. A004148, A110319, A107905, A110320, A132441.

Sequence in context: A192634 A350490 A304386 * A149953 A149954 A149955

Adjacent sequences: A140636 A140637 A140638 * A140640 A140641 A140642

Keyword

nonn

Author

Jonathan Vos Post, Jul 07 2008

Status

approved