Factor -3*r**3 - 504*r**2 - 21168*r.
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What is the l'th term of -3, 7, 27, 63, 121, 207, 327?
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What is the j'th term of -348, -346, -342, -336, -328, -318?
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What is the v'th term of 8238, 16479, 24720, 32961, 41202, 49443?
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What is the z'th term of 1280, 2580, 3882, 5186?
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What is the j'th term of 190, 181, 168, 151, 130?
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What is the u'th term of 2606, 5207, 7808, 10409?
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