Centered square numbers: a(n) = 4*n^2 + 4*n + 2.

Terms

a(0) =2a(1) =10a(2) =26a(3) =50a(4) =82a(5) =122a(6) =170a(7) =226a(8) =290a(9) =362a(10) =442a(11) =530a(12) =626a(13) =730a(14) =842a(15) =962a(16) =1090a(17) =1226a(18) =1370a(19) =1522a(20) =1682a(21) =1850a(22) =2026a(23) =2210a(24) =2402a(25) =2602a(26) =2810a(27) =3026a(28) =3250a(29) =3482