a(n) = 9*n^2 - 8*n + 2.

Terms

a(0) =2a(1) =3a(2) =22a(3) =59a(4) =114a(5) =187a(6) =278a(7) =387a(8) =514a(9) =659a(10) =822a(11) =1003a(12) =1202a(13) =1419a(14) =1654a(15) =1907a(16) =2178a(17) =2467a(18) =2774a(19) =3099a(20) =3442a(21) =3803a(22) =4182a(23) =4579a(24) =4994a(25) =5427a(26) =5878a(27) =6347a(28) =6834a(29) =7339