a(n) = (2*n-1)^2 + 14.

Terms

a(0) =15a(1) =23a(2) =39a(3) =63a(4) =95a(5) =135a(6) =183a(7) =239a(8) =303a(9) =375a(10) =455a(11) =543a(12) =639a(13) =743a(14) =855a(15) =975a(16) =1103a(17) =1239a(18) =1383a(19) =1535a(20) =1695a(21) =1863a(22) =2039a(23) =2223a(24) =2415a(25) =2615a(26) =2823a(27) =3039a(28) =3263a(29) =3495