Another 3-way generalization of series-parallel networks with n labeled edges.

A058562

Another 3-way generalization of series-parallel networks with n labeled edges.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =21a(4) =243a(5) =3933a(6) =81819a(7) =2080053a(8) =62490339a(9) =2166106509a(10) =85092601707

External references