Duplicate of A024468.

Terms

a(0) =2a(1) =3a(2) =8a(3) =12a(4) =28a(5) =38a(6) =73a(7) =95a(8) =170a(9) =206a(10) =352a(11) =426a(12) =715a(13) =827a(14) =1368a(15) =1602a(16) =2630a(17) =3028a(18) =4943a(19) =5461