Number of peakless Motzkin paths with no U H...HU's where U=(1,1) and H=(1,0) (can be easily expressed using RNA secondary structure terminology).

A098051

Number of peakless Motzkin paths with no U H...HU's where U=(1,1) and H=(1,0) (can be easily expressed using RNA secondary structure terminology).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =16a(7) =32a(8) =65a(9) =134a(10) =280a(11) =592a(12) =1264a(13) =2722a(14) =5906a(15) =12900a(16) =28344a(17) =62608a(18) =138949a(19) =309692a(20) =692905a(21) =1555718a(22) =3504016a(23) =7915182a(24) =17927154a(25) =40702926a(26) =92623758a(27) =211217180a(28) =482593474a(29) =1104640484

External references