Triangular T(n,k) = binomial(prime(n+1) - 1, prime(k+1) - 1) with T(n,0) = 1, read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =1a(6) =1a(7) =15a(8) =15a(9) =1a(10) =1a(11) =45a(12) =210a(13) =210a(14) =1a(15) =1a(16) =66a(17) =495a(18) =924a(19) =66a(20) =1a(21) =1a(22) =120a(23) =1820a(24) =8008a(25) =8008a(26) =1820a(27) =1a(28) =1a(29) =153