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What follows after 1 6 15 20 15?

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Anonymous

12y ago
Updated: 10/17/2024

-4.

One possible rule is

Un = (n4 - 26n3 + 155n2 - 238n + 120)/12 for n = 1, 2, 3, ...

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Wiki User

12y ago

What else can I help you with?