a(n) = 10*n^3.

Terms

a(0) =0a(1) =10a(2) =80a(3) =270a(4) =640a(5) =1250a(6) =2160a(7) =3430a(8) =5120a(9) =7290a(10) =10000a(11) =13310a(12) =17280a(13) =21970a(14) =27440a(15) =33750a(16) =40960a(17) =49130a(18) =58320a(19) =68590a(20) =80000a(21) =92610a(22) =106480a(23) =121670a(24) =138240a(25) =156250a(26) =175760a(27) =196830a(28) =219520a(29) =243890