Also known as the rotated hyper-ellipsoid function. The formula is given by $$f(\mathbf{x}) = \sum_{i=1}^n \left( \sum_{j=1}^{i} \mathbf{x}_j \right)^2$$ with \(\mathbf{x}_i \in [-65.536, 65.536], i = 1, \ldots, n\).
makeDoubleSumFunction(dimensions)[integer(1)]
Size of corresponding parameter space.
[smoof_single_objective_function]
H.-P. Schwefel. Evolution and Optimum Seeking. John Wiley & Sons, New York, 1995.