Number of triple-rises in all length n left factors of Dyck paths (triple-rise = three consecutive (1,1)-steps).

A191787

Number of triple-rises in all length n left factors of Dyck paths (triple-rise = three consecutive (1,1)-steps).

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =3a(5) =8a(6) =19a(7) =43a(8) =96a(9) =206a(10) =447a(11) =936a(12) =1998a(13) =4128a(14) =8718a(15) =17865a(16) =37446a(17) =76322a(18) =159079a(19) =323020a(20) =670350a(21) =1357496a(22) =2807370a(23) =5673526a(24) =11699768a(25) =23607548a(26) =48567174a(27) =97877248a(28) =200954796a(29) =404584032

External references