a(n) = 8*n^2 + 2*n + 1.

Terms

a(0) =1a(1) =11a(2) =37a(3) =79a(4) =137a(5) =211a(6) =301a(7) =407a(8) =529a(9) =667a(10) =821a(11) =991a(12) =1177a(13) =1379a(14) =1597a(15) =1831a(16) =2081a(17) =2347a(18) =2629a(19) =2927a(20) =3241a(21) =3571a(22) =3917a(23) =4279a(24) =4657a(25) =5051a(26) =5461a(27) =5887a(28) =6329a(29) =6787