Number of peaks at even level in all Dyck paths of semilength n that have no ascents and no descents of length 1.

A167639

Number of peaks at even level in all Dyck paths of semilength n that have no ascents and no descents of length 1.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =0a(4) =3a(5) =2a(6) =12a(7) =16a(8) =59a(9) =110a(10) =325a(11) =716a(12) =1926a(13) =4584a(14) =11887a(15) =29328a(16) =75071a(17) =188462a(18) =480778a(19) =1217876a(20) =3107689a(21) =7913082a(22) =20221903a(23) =51664040a(24) =132259190a(25) =338721180a(26) =868587021a(27) =2228677360a(28) =5723740309a(29) =14709001454

External references