Triangle read by rows: for 1 <= k < n, a(n, k) is the least number not already used. For n > 1, a(n, n) is the least number not already used such that the product of the n-th row is a multiple of the product of the previous row.

A094275

Triangle read by rows: for 1 <= k < n, a(n, k) is the least number not already used. For n > 1, a(n, n) is the least number not already used such that the product of the n-th row is a multiple of the product of the previous row.