It's Definitely Not Geometric

Calculus Level 2

$1 + \frac {1}{\color{#3D99F6}2} + \frac {1}{\color{#3D99F6}6} + \frac {1}{\color{#3D99F6}{12}} + \frac {1}{\color{#3D99F6}{20}} + \ldots = \ \color{teal}?$