a(n) = Product_{k=1..n} (16 - 4/k).

A216702

a(n) = Product_{k=1..n} (16 - 4/k).

Terms

    a(0) =1a(1) =12a(2) =168a(3) =2464a(4) =36960a(5) =561792a(6) =8614144a(7) =132903936a(8) =2060011008a(9) =32044615680a(10) =499896004608

External references