It is easy to see that the above triangle is also Pascal-like triangle. We have not proved that the list {U12(n,m), n=2,... and m ≤n} forms Pascal-like triangle mathematically.
The first number in each row is {1,1,3,4,6,8,11,13,17,20,24,28,33,37, ...}
We found out that this sequence satisfies the following formula.