a(n) = 324*n^2 - 336*n + 102 (n >= 1).

Terms

a(0) =90a(1) =726a(2) =2010a(3) =3942a(4) =6522a(5) =9750a(6) =13626a(7) =18150a(8) =23322a(9) =29142a(10) =35610a(11) =42726a(12) =50490a(13) =58902a(14) =67962a(15) =77670a(16) =88026a(17) =99030a(18) =110682a(19) =122982a(20) =135930a(21) =149526a(22) =163770a(23) =178662a(24) =194202a(25) =210390a(26) =227226a(27) =244710a(28) =262842a(29) =281622