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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = -(2*n - 1 - x)*v[i - 1]); v};\nrow(n, p) = {my(c = Vecrev(p)); c = concat(c, vector(n + 1 - #c)); c = Vecrev(c); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i - 1, v[i])))};\nT(9)","reading":{"first_row":1,"offset":0,"reversed":true,"trim_zeros":"none","regular_triangle":true}}],"derivation":{"root":"n-4f6e747b794bcc2e","steps":["x \u21a6 \u2212x (shift -1)"],"edges":["e-d7c9e146299b18aa"],"text":"A028338 \u2192 x \u21a6 \u2212x (shift -1)"},"headline":"A039757: Triangle of coefficients in expansion of (x-1)*(x-3)*(x-5)*...*(x-(2*n-1)).","chain":"A028338 \u2192 x \u21a6 \u2212x (shift -1)"}