If a, b in sequence, so is ab+8.

Terms

a(0) =2a(1) =12a(2) =32a(3) =72a(4) =152a(5) =312a(6) =392a(7) =632a(8) =792a(9) =872a(10) =1032a(11) =1272a(12) =1592a(13) =1752a(14) =1832a(15) =2072a(16) =2312a(17) =2552a(18) =3192a(19) =3512a(20) =3672a(21) =3752a(22) =4152a(23) =4632a(24) =4712a(25) =4872a(26) =5112a(27) =5192a(28) =6392a(29) =7032