a(n+1) = a(n)(a(0) + ... + a(n)).A001697a(n+1) = a(n)(a(0) + ... + a(n)).Terms a(0) =1a(1) =1a(2) =2a(3) =8a(4) =96a(5) =10368a(6) =108615168External referencesoeis: A001697