a(n) = 4*n^2 + 6*n + 1.

Terms

a(0) =1a(1) =11a(2) =29a(3) =55a(4) =89a(5) =131a(6) =181a(7) =239a(8) =305a(9) =379a(10) =461a(11) =551a(12) =649a(13) =755a(14) =869a(15) =991a(16) =1121a(17) =1259a(18) =1405a(19) =1559a(20) =1721a(21) =1891a(22) =2069a(23) =2255a(24) =2449a(25) =2651a(26) =2861a(27) =3079a(28) =3305a(29) =3539