Sum of pyramid weights of all Dyck paths of semilength n that have no ascents and no descents of length 1.

A166302

Sum of pyramid weights of all Dyck paths of semilength n that have no ascents and no descents of length 1.

Terms

    a(0) =0a(1) =0a(2) =2a(3) =3a(4) =8a(5) =19a(6) =44a(7) =106a(8) =257a(9) =628a(10) =1549a(11) =3844a(12) =9588a(13) =24020a(14) =60391a(15) =152298a(16) =385085a(17) =975904a(18) =2478129a(19) =6303861a(20) =16060946a(21) =40977605a(22) =104682165a(23) =267730426a(24) =685451776a(25) =1756593392a(26) =4505537267a(27) =11565724164a(28) =29711413595a(29) =76379060176

External references