a(n) = 42*n^2 + 1.

Terms

a(0) =1a(1) =43a(2) =169a(3) =379a(4) =673a(5) =1051a(6) =1513a(7) =2059a(8) =2689a(9) =3403a(10) =4201a(11) =5083a(12) =6049a(13) =7099a(14) =8233a(15) =9451a(16) =10753a(17) =12139a(18) =13609a(19) =15163a(20) =16801a(21) =18523a(22) =20329a(23) =22219a(24) =24193a(25) =26251a(26) =28393a(27) =30619a(28) =32929a(29) =35323