Triangle read by rows: let f(n,m)=Product[k + m + 1, {k, 0, n}]; t0(n,m)=f(n, m)/(f(n - m, m)); then t(n,m)=t0(n,m)+t0(n,n-m).

A155720

Triangle read by rows: let f(n,m)=Product[k + m + 1, {k, 0, n}]; t0(n,m)=f(n, m)/(f(n - m, m)); then t(n,m)=t0(n,m)+t0(n,n-m).