a(n) = 18*n^2 + 1.

Terms

a(0) =19a(1) =73a(2) =163a(3) =289a(4) =451a(5) =649a(6) =883a(7) =1153a(8) =1459a(9) =1801a(10) =2179a(11) =2593a(12) =3043a(13) =3529a(14) =4051a(15) =4609a(16) =5203a(17) =5833a(18) =6499a(19) =7201a(20) =7939a(21) =8713a(22) =9523a(23) =10369a(24) =11251a(25) =12169a(26) =13123a(27) =14113a(28) =15139a(29) =16201