a(n) = 10*n^2.

Terms

a(0) =0a(1) =10a(2) =40a(3) =90a(4) =160a(5) =250a(6) =360a(7) =490a(8) =640a(9) =810a(10) =1000a(11) =1210a(12) =1440a(13) =1690a(14) =1960a(15) =2250a(16) =2560a(17) =2890a(18) =3240a(19) =3610a(20) =4000a(21) =4410a(22) =4840a(23) =5290a(24) =5760a(25) =6250a(26) =6760a(27) =7290a(28) =7840a(29) =8410