a(n) = 6561*n^2 - 3564*n + 485.

Terms

a(0) =485a(1) =3482a(2) =19601a(3) =48842a(4) =91205a(5) =146690a(6) =215297a(7) =297026a(8) =391877a(9) =499850a(10) =620945a(11) =755162a(12) =902501a(13) =1062962a(14) =1236545a(15) =1423250a(16) =1623077a(17) =1836026a(18) =2062097a(19) =2301290a(20) =2553605a(21) =2819042a(22) =3097601a(23) =3389282a(24) =3694085a(25) =4012010a(26) =4343057a(27) =4687226