Number of peakless Motzkin paths of length n having no valleys (i.e., (1,-1) followed by (1,1)) at level zero (can be easily translated into RNA secondary structure terminology).
A110334
Number of peakless Motzkin paths of length n having no valleys (i.e., (1,-1) followed by (1,1)) at level zero (can be easily translated into RNA secondary structure terminology).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =16a(7) =33a(8) =70a(9) =152a(10) =336a(11) =754a(12) =1714a(13) =3940a(14) =9145a(15) =21406a(16) =50478a(17) =119814a(18) =286045a(19) =686456a(20) =1655053a(21) =4007131a(22) =9738812a(23) =23750895a(24) =58106547a(25) =142569506a(26) =350738607a(27) =864980279a(28) =2138034715a(29) =5295877279
External references
- oeis: A110334