Number of Dyck paths of semilength n such that neighboring peaks differ in height by exactly one and first and last peak are at height one.

A371727

Number of Dyck paths of semilength n such that neighboring peaks differ in height by exactly one and first and last peak are at height one.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =0a(4) =1a(5) =0a(6) =0a(7) =2a(8) =2a(9) =1a(10) =5a(11) =12a(12) =16a(13) =28a(14) =65a(15) =128a(16) =237a(17) =478a(18) =990a(19) =2006a(20) =4086a(21) =8469a(22) =17644a(23) =36826a(24) =77305a(25) =163195a(26) =345798a(27) =735302a(28) =1569379a(29) =3360821

External references