Triangle read by rows: T(n,k) = number of peakless Motzkin paths of length n containing k UHH...HD's, where U=(1,1), D=(1,-1) and H=(1,0) (can be easily expressed using RNA secondary structure terminology).

A089741

Triangle read by rows: T(n,k) = number of peakless Motzkin paths of length n containing k UHH...HD's, where U=(1,1), D=(1,-1) and H=(1,0) (can be easily expressed using RNA secondary structure terminology).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =1a(8) =7a(9) =1a(10) =15a(11) =1a(12) =1a(13) =31a(14) =5a(15) =1a(16) =63a(17) =18a(18) =1a(19) =127a(20) =56a(21) =1a(22) =1a(23) =255a(24) =160a(25) =7a(26) =1a(27) =511a(28) =432a(29) =34

External references