1956209024domain: NAppears in sequencesTriangle of coefficients T(n,k) of y^n in Product_{k=0..n-2} (n + (n + k)*y + n*y^2), as read by rows of terms k = 0..2*n-2, for n >= 1.at n=56A324956a(n) is the coefficient of y^(n-1) in Product_{k=0..n-2} (n + (n + k)*y + n*y^2), for n >= 1.at n=7A324957