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You can do:
sage: BinaryQF_reduced_representatives(-47)
[x^2 + x*y + 12*y^2,
2*x^2 - x*y + 6*y^2,
2*x^2 + x*y + 6*y^2,
3*x^2 - x*y + 4*y^2,
3*x^2 + x*y + 4*y^2]
and to get the coefficients:
sage: [qf.polynomial().coefficients() for qf in BinaryQF_reduced_representatives(-47)]
[[1, 1, 12], [2, -1, 6], [2, 1, 6], [3, -1, 4], [3, 1, 4]]
