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v[1] = 1; v[2] = -1 + x; for(n = 3, N, my(i = n); v[i] = -(n - 1 - x)*v[i - 1] - (n - 1)*v[i - 2]); v};\nrow(n, p) = {my(c = Vecrev(p)); c = concat(c, vector(n - #c)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};\nT(10)","reading":{"first_row":0,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":true}}],"derivation":{"root":"n-4ae73ef2b17633d9","steps":[],"edges":[],"text":"A137338"},"headline":"A137338: Triangle read by rows: T(n,k), 0 <= k <= n, gives the coefficients of the Charlier polynomials (with parameter a=1), ordered by rising powers.","chain":null}