a(n) = 361*n^2 - 2*n.

Terms

a(0) =359a(1) =1440a(2) =3243a(3) =5768a(4) =9015a(5) =12984a(6) =17675a(7) =23088a(8) =29223a(9) =36080a(10) =43659a(11) =51960a(12) =60983a(13) =70728a(14) =81195a(15) =92384a(16) =104295a(17) =116928a(18) =130283a(19) =144360a(20) =159159a(21) =174680a(22) =190923a(23) =207888a(24) =225575a(25) =243984a(26) =263115a(27) =282968a(28) =303543a(29) =324840