a(n) = Product_{i=0..n-1} (9*i+2).

A084949

a(n) = Product_{i=0..n-1} (9*i+2).

Terms

    a(0) =1a(1) =2a(2) =22a(3) =440a(4) =12760a(5) =484880a(6) =22789360a(7) =1276204160a(8) =82953270400

External references