Recurrence Formula for 3,5,13,27,55,...

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intervoxel
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What is the recurrence formula for the sequence

[3,5,13,27,55,...]

Thank you for any help.
 
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mfb said:
There is an infinite set of formulas that lead to this sequence.
Unless you made a typo, all of them are somewhat ugly.
You are right. It is 6 instead of 5. Thank you for the valuable link.
 

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