Number of edge covers in the n-gear graph.

Terms

a(0) =3a(1) =25a(2) =162a(3) =969a(4) =5613a(5) =32062a(6) =181989a(7) =1030017a(8) =5821902a(9) =32886505a(10) =185714829a(11) =1048619646a(12) =5920559661a(13) =33426829321a(14) =188721717102