a(n) = C(prime(n+2), prime(n)).

Terms

a(0) =10a(1) =35a(2) =462a(3) =1716a(4) =12376a(5) =27132a(6) =100947a(7) =20030010a(8) =7888725a(9) =38608020a(10) =1121099408a(11) =6096454a(12) =10737573a(13) =19499099620a(15) =2944827765a(16) =6522361560a(17) =461738052776a(18) =170230452a(19) =26088783435