The denominators in the second diagonals are the pronic numbers 6, 12, 20, 30, 42, 56, 72, 90, 110,
132, ... (OEIS A002378). A sorted list of all
possible denominators in the triangle is given by 6, 12, 20, 30, 42, 56, 60, 72,
90, 105, 110, ... (OEIS A007622).

The row sums are given by 1, 1, 5/6, 2/3, 8/15, 13/30, 151/420, ... (OEIS A046878 and A046879). The sums of the denominators
in the th
row are given by , giving the first few as 1, 4, 12, 32, 80, 192,
448, ... (OEIS A001787).