a(1) = 1; a(n) = a(n-1) + (n!)^3.A138564a(1) = 1; a(n) = a(n-1) + (n!)^3.Terms a(0) =1a(1) =9a(2) =225a(3) =14049a(4) =1742049a(5) =374990049a(6) =128399054049External referencesoeis: A138564