a(n) = 6*n^2 + 2 for n > 0, a(0)=1.

Terms

a(0) =1a(1) =8a(2) =26a(3) =56a(4) =98a(5) =152a(6) =218a(7) =296a(8) =386a(9) =488a(10) =602a(11) =728a(12) =866a(13) =1016a(14) =1178a(15) =1352a(16) =1538a(17) =1736a(18) =1946a(19) =2168a(20) =2402a(21) =2648a(22) =2906a(23) =3176a(24) =3458a(25) =3752a(26) =4058a(27) =4376a(28) =4706a(29) =5048