What is the sum of the following sequence:
Σ(-1)^(k+1) (2k-1)^2 for k=1...n
for different n?
Additional test cases have been added.
Please check your test suites, results must have opposite signs.
Thanks! The problem now is reformulated;)
Swap the first and last columns
Test for balanced parentheses
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Beginner's Problem - Squaring
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Sum of series III
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