a(n) = (5*n + 1)^2 + 4*n + 1.

Terms

a(0) =2a(1) =41a(2) =130a(3) =269a(4) =458a(5) =697a(6) =986a(7) =1325a(8) =1714a(9) =2153a(10) =2642a(11) =3181a(12) =3770a(13) =4409a(14) =5098a(15) =5837a(16) =6626a(17) =7465a(18) =8354a(19) =9293a(20) =10282a(21) =11321a(22) =12410a(23) =13549a(24) =14738a(25) =15977a(26) =17266a(27) =18605a(28) =19994a(29) =21433