a(n) = Product_{i=0..n-1} (8*i+2).

A084948

a(n) = Product_{i=0..n-1} (8*i+2).

Terms

    a(0) =1a(1) =2a(2) =20a(3) =360a(4) =9360a(5) =318240a(6) =13366080a(7) =668304000a(8) =38761632000

External references