What is the sum of the following sequence:
Σ(2k-1)^2 for k=1...n
for different n?
Additional test cases have been added.
Find the sum of the elements in the "second" diagonal
Rotate input square matrix 90 degrees CCW without rot90
Append two matrix as shown below example
Find the sum of n squares
Sum of series III
Sum of series VI
Sum of series V
Sum of series VII
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