count lattice2 by lynn(llhuii, explained)

N=lambda r:1+4*sum(r/(4*i+1)-r/(4*i+3) for i in range(999))

# sum results for z-slices of cubic lattice:
for r in range(51): print sum(N(r*r-z*z) for z in range(-r,r+1))

# then golf a lot :)

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