Triangle read by rows: T(n,k) = prime(n)#/prime(k)#, 0<=k<=n.

Terms

a(0) =1a(1) =2a(2) =1a(3) =6a(4) =3a(5) =1a(6) =30a(7) =15a(8) =5a(9) =1a(10) =210a(11) =105a(12) =35a(13) =7a(14) =1a(15) =2310a(16) =1155a(17) =385a(18) =77a(19) =11a(20) =1a(21) =30030a(22) =15015a(23) =5005a(24) =1001a(25) =143a(26) =13a(27) =1a(28) =510510a(29) =255255