a(n) = 144*n^2 - 2*n.

Terms

a(0) =142a(1) =572a(2) =1290a(3) =2296a(4) =3590a(5) =5172a(6) =7042a(7) =9200a(8) =11646a(9) =14380a(10) =17402a(11) =20712a(12) =24310a(13) =28196a(14) =32370a(15) =36832a(16) =41582a(17) =46620a(18) =51946a(19) =57560a(20) =63462a(21) =69652a(22) =76130a(23) =82896a(24) =89950a(25) =97292a(26) =104922a(27) =112840a(28) =121046a(29) =129540