a(n) = a(n-1)*(a(n-1)^2 - 1) with a(0) = 2.A361086a(n) = a(n-1)*(a(n-1)^2 - 1) with a(0) = 2.Terms a(0) =2a(1) =6a(2) =210a(3) =9260790External referencesoeis: A361086