a(n) = Product_{k=1..n} (2^k + k).

A277355

a(n) = Product_{k=1..n} (2^k + k).

Terms

    a(0) =1a(1) =3a(2) =18a(3) =198a(4) =3960a(5) =146520a(6) =10256400a(7) =1384614000a(8) =365538096000

External references