a(n) = lcm(prime(n)+1, prime(n+1)+1) / 2.

Terms

a(0) =6a(1) =6a(2) =12a(3) =12a(4) =42a(5) =63a(6) =90a(7) =60a(8) =60a(9) =240a(10) =304a(11) =399a(12) =462a(13) =264a(14) =216a(15) =270a(16) =930a(17) =1054a(18) =612a(19) =1332a(20) =1480a(21) =840a(22) =630a(23) =2205a(24) =2499a(25) =2652a(26) =1404a(27) =2970a(28) =3135a(29) =3648