300659985630domain: NAppears in sequencesa(n) = n-th elementary symmetric function of the first n+1 positive integers congruent to 1 mod 4.at n=9A024382Triangle read by rows: T(n, k) is the Sheffer triangle ((1 - 4*x)^(-1/4), (-1/4)*log(1 - 4*x)). A generalized Stirling1 triangle.at n=56A290319