a(n) = 81*n^2 + 2*n.

Terms

a(0) =83a(1) =328a(2) =735a(3) =1304a(4) =2035a(5) =2928a(6) =3983a(7) =5200a(8) =6579a(9) =8120a(10) =9823a(11) =11688a(12) =13715a(13) =15904a(14) =18255a(15) =20768a(16) =23443a(17) =26280a(18) =29279a(19) =32440a(20) =35763a(21) =39248a(22) =42895a(23) =46704a(24) =50675a(25) =54808a(26) =59103a(27) =63560a(28) =68179a(29) =72960