a(n) = A051193(A072109(n))/A018804(A072109(n)).

Terms

a(0) =1a(1) =3a(2) =72a(3) =1915a(4) =25795a(5) =19162a(6) =20236a(7) =75259a(8) =1554957a(9) =1491432a(10) =17313036a(11) =16732368a(12) =24256243a(13) =36578268a(14) =44514226a(15) =75661104a(16) =292402908a(17) =5482272832a(18) =1178829937a(19) =5302997764a(20) =18154748952a(21) =28439854393a(22) =16773808684a(23) =47254132795a(24) =53265315697a(25) =74423911503a(26) =141806992844