Partial products of A007425.

Terms

a(0) =1a(1) =3a(2) =9a(3) =54a(4) =162a(5) =1458a(6) =4374a(7) =43740a(8) =262440a(9) =2361960a(10) =7085880a(11) =127545840a(12) =382637520a(13) =3443737680a(14) =30993639120a(15) =464904586800