Number of valleys (i.e., (1,-1) followed by (1,1)) at level zero in all peakless Motzkin paths of length n+6 (can be easily translated into RNA secondary structure terminology).
A110335
Number of valleys (i.e., (1,-1) followed by (1,1)) at level zero in all peakless Motzkin paths of length n+6 (can be easily translated into RNA secondary structure terminology).
Terms
- a(0) =1a(1) =4a(2) =12a(3) =34a(4) =92a(5) =242a(6) =627a(7) =1608a(8) =4096a(9) =10388a(10) =26269a(11) =66304a(12) =167161a(13) =421162a(14) =1060816a(15) =2671908a(16) =6730941a(17) =16961430a(18) =42758695a(19) =107843080a(20) =272136858a(21) =687106696a(22) =1735849310a(23) =4387895300a(24) =11098372185a(25) =28088028612a(26) =71128006458a(27) =180224822694
External references
- oeis: A110335