a(n) = ((8*n+10)(!^8))/20, related to A034908 ((8*n+2)(!^8) octo- or 8-factorials).

A053115

a(n) = ((8*n+10)(!^8))/20, related to A034908 ((8*n+2)(!^8) octo- or 8-factorials).

Terms

    a(0) =1a(1) =18a(2) =468a(3) =15912a(4) =668304a(5) =33415200a(6) =1938081600a(7) =127913385600

External references