a(n) = 972*n^2 - 1224*n + 414 with n > 0.

Terms

a(0) =162a(1) =1854a(2) =5490a(3) =11070a(4) =18594a(5) =28062a(6) =39474a(7) =52830a(8) =68130a(9) =85374a(10) =104562a(11) =125694a(12) =148770a(13) =173790a(14) =200754a(15) =229662a(16) =260514a(17) =293310a(18) =328050a(19) =364734a(20) =403362a(21) =443934a(22) =486450a(23) =530910a(24) =577314a(25) =625662a(26) =675954a(27) =728190a(28) =782370a(29) =838494