a(n) = 169*n^2 - n.

Terms

a(0) =168a(1) =674a(2) =1518a(3) =2700a(4) =4220a(5) =6078a(6) =8274a(7) =10808a(8) =13680a(9) =16890a(10) =20438a(11) =24324a(12) =28548a(13) =33110a(14) =38010a(15) =43248a(16) =48824a(17) =54738a(18) =60990a(19) =67580a(20) =74508a(21) =81774a(22) =89378a(23) =97320a(24) =105600a(25) =114218a(26) =123174a(27) =132468a(28) =142100a(29) =152070