144*n^2 - n.

Terms

a(0) =143a(1) =574a(2) =1293a(3) =2300a(4) =3595a(5) =5178a(6) =7049a(7) =9208a(8) =11655a(9) =14390a(10) =17413a(11) =20724a(12) =24323a(13) =28210a(14) =32385a(15) =36848a(16) =41599a(17) =46638a(18) =51965a(19) =57580a(20) =63483a(21) =69674a(22) =76153a(23) =82920a(24) =89975a(25) =97318a(26) =104949a(27) =112868a(28) =121075a(29) =129570