Number of spanning trees of the class H_3.

Terms

a(0) =75a(1) =336a(2) =1488a(3) =6580a(4) =29085a(5) =128544a(6) =568101a(7) =2510716a(8) =11096064a(9) =49038840a(10) =216726195a(11) =957817168a(12) =4233054171a(13) =18707899800a(14) =82679195856a(15) =365399082748