Duplicate of A048692.

Terms

a(0) =2a(1) =6a(2) =10a(3) =30a(4) =42a(5) =60a(6) =210a(7) =330a(8) =390a(9) =420a(10) =2310a(11) =2730a(12) =3570a(13) =3990a(14) =4290a(15) =30030a(16) =39270