a(n) = 66*n^2 + 1.

Terms

a(0) =1a(1) =67a(2) =265a(3) =595a(4) =1057a(5) =1651a(6) =2377a(7) =3235a(8) =4225a(9) =5347a(10) =6601a(11) =7987a(12) =9505a(13) =11155a(14) =12937a(15) =14851a(16) =16897a(17) =19075a(18) =21385a(19) =23827a(20) =26401a(21) =29107a(22) =31945a(23) =34915a(24) =38017a(25) =41251a(26) =44617a(27) =48115a(28) =51745a(29) =55507