a(n) = 2*n^3 - 4*n^2 + 10*n - 2 (n>=1).

Terms

a(0) =6a(1) =18a(2) =46a(3) =102a(4) =198a(5) =346a(6) =558a(7) =846a(8) =1222a(9) =1698a(10) =2286a(11) =2998a(12) =3846a(13) =4842a(14) =5998a(15) =7326a(16) =8838a(17) =10546a(18) =12462a(19) =14598a(20) =16966a(21) =19578a(22) =22446a(23) =25582a(24) =28998a(25) =32706a(26) =36718a(27) =41046a(28) =45702a(29) =50698