a(n) = Product_{j=0..n-1} (2^j + 2).

A139486

a(n) = Product_{j=0..n-1} (2^j + 2).

Terms

    a(0) =1a(1) =3a(2) =12a(3) =72a(4) =720a(5) =12960a(6) =440640a(7) =29082240a(8) =3780691200a(9) =975418329600

External references