a(n) = 76*n^2 + 1.

Terms

a(0) =1a(1) =77a(2) =305a(3) =685a(4) =1217a(5) =1901a(6) =2737a(7) =3725a(8) =4865a(9) =6157a(10) =7601a(11) =9197a(12) =10945a(13) =12845a(14) =14897a(15) =17101a(16) =19457a(17) =21965a(18) =24625a(19) =27437a(20) =30401a(21) =33517a(22) =36785a(23) =40205a(24) =43777a(25) =47501a(26) =51377a(27) =55405a(28) =59585a(29) =63917