351504domain: NAppears in sequencesTriangle read by rows: row n (n>=0) has g.f. Sum_{i=1..n} n!*x^i*(1+x)^(n-i)/(n+1-i).at n=42A126671Third diagonal of A126671.at n=6A126673(n-1)-st elementary symmetric function of the first n terms of (1,2,1,3,1,4,1,5,...)=A133622.at n=13A203193