Return how many integer grid points there are inside a 3D sphere of radius r centred at (0,0,0) (including points on the edge).
Neither string operations nor interpolations are allowed!
vectorization in N
Multiply a column by a row
Edges of a n-dimensional Hypercube
Chebyshev polynomials of the 2nd Kind
Chebyshev polynomials of the 1st Kind
Generalized Laguerre polynomials
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