Name this sequence

Calculus Level 2

W=2+5x+9x2+14x3+20x4+W=2+5x+9x^2+14x^3+20x^4+\cdots

Given x<1|x|<1, find the value of the series WW.

Clarification: 2,5,9,14,20,2,5,9,14,20,\ldots follows a 2nd2^{\text{nd}}-degree polynomial function, i.e. their second finite difference is a constant.

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