Combinatorics of RNA Hairpins and Cloverleaves

摘要

For an abstract single‐stranded RNA, a combinatorial analysis is given for two important structures, hairpins and cloverleaves. The number of possible hairpins isO(2n), while the number of possible three‐petal cloverleaves isO(n32n), and the number of possible general cloverleaves isO((2.21