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5*n + 3 - (20*n^4 - 148*n^3 + 369*n^2 - 350*n + 109)*x + (8*n^6 - 92*n^5 + 326*n^4 - 269*n^3 - 632*n^2 + 1200*n - 541)*x^2 + (24*n^6 - 244*n^5 + 982*n^4 - 1987*n^3 + 2115*n^2 - 1117*n + 227)*x^3)*P[n - 1, x] + ((4*n - 4)*x - (40*n^3 - 176*n^2 + 238*n - 102)*x^2 + (16*n^5 - 112*n^4 + 332*n^3 - 524*n^2 + 420*n - 132)*x^3 - (16*n^5 - 112*n^4 + 292*n^3 - 348*n^2 + 186*n - 34)*x^4)*D[P[n - 1, x], x])/(2*n^2 - 9*n + 10 - (20*n^4 - 188*n^3 + 659*n^2 - 1021*n + 590)*x + (8*n^6 - 108*n^5 + 606*n^4 - 1809*n^3 + 3030*n^2 - 2700*n + 1000)*x^2)]];\nTable[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten","pari":"P(N) = {my(v = vector(N)); v[1] = 0; v[2] = 1; for(n = 3, N, my(i = n); v[i] = ((2*n^2 - 5*n + 3 - (20*n^4 - 148*n^3 + 369*n^2 - 350*n + 109)*x + (8*n^6 - 92*n^5 + 326*n^4 - 269*n^3 - 632*n^2 + 1200*n - 541)*x^2 + (24*n^6 - 244*n^5 + 982*n^4 - 1987*n^3 + 2115*n^2 - 1117*n + 227)*x^3)*v[i - 1] + ((4*n - 4)*x - (40*n^3 - 176*n^2 + 238*n - 102)*x^2 + (16*n^5 - 112*n^4 + 332*n^3 - 524*n^2 + 420*n - 132)*x^3 - (16*n^5 - 112*n^4 + 292*n^3 - 348*n^2 + 186*n - 34)*x^4)*deriv(v[i - 1], x))/(2*n^2 - 9*n + 10 - (20*n^4 - 188*n^3 + 659*n^2 - 1021*n + 590)*x + (8*n^6 - 108*n^5 + 606*n^4 - 1809*n^3 + 3030*n^2 - 2700*n + 1000)*x^2)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};\nT(10)","reading":{"first_row":1,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-f7935c36a3c0ec8c","steps":["D","(\u03b8+1)\u00b2"],"edges":["e-13f8569d458f0f6e","e-330d6c5baa0bf53b"],"text":"A086645 \u2192 D \u2192 (\u03b8+1)\u00b2"},"headline":"A086645 \u2192 D \u2192 (\u03b8+1)\u00b2","chain":null}