Find an approximation of the sum of the series accurate to two decimal places. 
Definitions:
Abstract Operational Stage
This term combines aspects of Piaget's concrete operational and formal operational stages, but correctly, it's the formal operational stage, where adolescents and adults think abstractly, reason logically, and plan systematically.
Tertiary Circular Reactions
A cognitive developmental stage in Piaget's theory, occurring around 12 to 18 months, where infants experiment with new activities and explore the outcomes.
Sensorimotor Period
The first stage in Jean Piaget's theory of cognitive development, occurring from birth to about age 2, where infants learn through sensory experiences and manipulating objects.
Decentering
A cognitive ability to consider multiple aspects of a situation or adopt another person's perspective, vital in developing empathy and solving problems effectively.
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