a(n) = (9*n+2)*(9*n+7).

Terms

a(0) =14a(1) =176a(2) =500a(3) =986a(4) =1634a(5) =2444a(6) =3416a(7) =4550a(8) =5846a(9) =7304a(10) =8924a(11) =10706a(12) =12650a(13) =14756a(14) =17024a(15) =19454a(16) =22046a(17) =24800a(18) =27716a(19) =30794a(20) =34034a(21) =37436a(22) =41000a(23) =44726a(24) =48614a(25) =52664a(26) =56876a(27) =61250a(28) =65786a(29) =70484