a(n) = (1/3)*Product_{k=0..n} (F(k)+3), where F=A000045 (Fibonacci numbers).

A374982

a(n) = (1/3)*Product_{k=0..n} (F(k)+3), where F=A000045 (Fibonacci numbers).

Terms

    a(0) =1a(1) =4a(2) =16a(3) =80a(4) =480a(5) =3840a(6) =42240a(7) =675840a(8) =16220160a(9) =600145920a(10) =34808463360

External references