a(n) = 378*n^2 - 54*n (n>=1).

Terms

a(0) =324a(1) =1404a(2) =3240a(3) =5832a(4) =9180a(5) =13284a(6) =18144a(7) =23760a(8) =30132a(9) =37260a(10) =45144a(11) =53784a(12) =63180a(13) =73332a(14) =84240a(15) =95904a(16) =108324a(17) =121500a(18) =135432a(19) =150120a(20) =165564a(21) =181764a(22) =198720a(23) =216432a(24) =234900a(25) =254124a(26) =274104a(27) =294840a(28) =316332a(29) =338580