Number of palstars of length 2n over an alphabet of size 3.

A246020

Number of palstars of length 2n over an alphabet of size 3.

Terms

    a(0) =1a(1) =3a(2) =15a(3) =81a(4) =435a(5) =2349a(6) =12681a(7) =68499a(8) =370023a(9) =1998945a(10) =10798821a(11) =58338495a(12) =315162657a(13) =1702608147a(14) =9198028791a(15) =49690672857a(16) =268444806483

External references