a(n) = 34*n^2 + 1.

Terms

a(0) =1a(1) =35a(2) =137a(3) =307a(4) =545a(5) =851a(6) =1225a(7) =1667a(8) =2177a(9) =2755a(10) =3401a(11) =4115a(12) =4897a(13) =5747a(14) =6665a(15) =7651a(16) =8705a(17) =9827a(18) =11017a(19) =12275a(20) =13601a(21) =14995a(22) =16457a(23) =17987a(24) =19585a(25) =21251a(26) =22985a(27) =24787a(28) =26657a(29) =28595