Number of Motzkin paths of length n in 3D with no level steps at odd level.

A118677

Number of Motzkin paths of length n in 3D with no level steps at odd level.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =18a(4) =60a(5) =202a(6) =718a(7) =2600a(8) =9748a(9) =37270a(10) =146058a(11) =582548a(12) =2367028a(13) =9761890a(14) =40844168a(15) =173001018a(16) =741193056a(17) =3207480526a(18) =14008373662a(19) =61683982696a(20) =273658651700

External references