Number of unlabeled pentagonal 2-trees with n pentagons.

A094611

Number of unlabeled pentagonal 2-trees with n pentagons.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =11a(5) =56a(6) =359a(7) =2597a(8) =20386a(9) =167819a(10) =1429815a(11) =12500748a(12) =111595289a(13) =1013544057a(14) =9340950309a(15) =87176935700a(16) =822559721606

External references