$$x(x+1)(x+2)(x+3)/x(x+1)$$
$\left(x+2\right)\left(x+3\right)\left(x+1\right)^{2}$
$$\left(x+1\right)\left(x+2\right)\left(x+3\right)\left(x+1\right)$$
$$\left(x^{2}+2x+x+2\right)\left(x+3\right)\left(x+1\right)$$
$$\left(x^{2}+3x+2\right)\left(x+3\right)\left(x+1\right)$$
$$\left(x^{3}+3x^{2}+3x^{2}+9x+2x+6\right)\left(x+1\right)$$
$$\left(x^{3}+6x^{2}+9x+2x+6\right)\left(x+1\right)$$
$$\left(x^{3}+6x^{2}+11x+6\right)\left(x+1\right)$$
$$x^{4}+x^{3}+6x^{3}+6x^{2}+11x^{2}+11x+6x+6$$
$$x^{4}+7x^{3}+6x^{2}+11x^{2}+11x+6x+6$$
$$x^{4}+7x^{3}+17x^{2}+11x+6x+6$$
$$x^{4}+7x^{3}+17x^{2}+17x+6$$
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$x^{4}+7x^{3}+17x^{2}+17x+6$