355572domain: NAppears in sequencesa(n) = 3rd elementary symmetric function of the first n+2 positive integers congruent to 1 mod 4.at n=6A024379Triangle 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=51A290319