Semiprimes in A006987(n), or semiprime binomial coefficients: C(n,k), 2 <= k <= n-2.

Terms

a(0) =6a(1) =10a(2) =15a(3) =21a(4) =35a(5) =55a(6) =91a(7) =253a(8) =703a(9) =1081a(10) =1711a(11) =1891a(12) =2701a(13) =3403a(14) =5671a(15) =12403a(16) =13861a(17) =15931a(18) =18721a(19) =25651a(20) =34453a(21) =38503a(22) =49141a(23) =60031a(24) =64261a(25) =73153a(26) =79003a(27) =88831a(28) =104653a(29) =108811