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It could be any number of your choice. Pick a number and I can find you a quartic (power 4) polynomial which will give the above four and your choice as the first five terms.

But the simplest cubic rule is

Un = (n3 - 6n2 + 8)/3 for n = 1, 2, 3, ...

which gives

U5 = 5

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11y ago

What else can I help you with?