a(n) = prime(n)*a(n-1) - a(n-2).

Terms

a(0) =1a(1) =1a(2) =2a(3) =9a(4) =61a(5) =662a(6) =8545a(7) =144603a(8) =2738912a(9) =62850373a(10) =1819921905a(11) =56354728682