a(n) = 11^n - n^3.

Terms

a(0) =1a(1) =10a(2) =113a(3) =1304a(4) =14577a(5) =160926a(6) =1771345a(7) =19486828a(8) =214358369a(9) =2357946962a(10) =25937423601a(11) =285311669280