Find the pattern: 12, 44, 130, 342, 840

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Double Exp.JPG
It is clearly a double exponential.
 
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zoki85 said:
... There's possibility no analytical function that coincides with all terms exactly ...
Example? What is the shortest such sequence?
 
Keith_McClary said:
Example? What is the shortest such sequence?
No sequence is determined by giving finite number of terms
 
zoki85 said:
No sequence is determined by giving finite number of terms
I thought you were saying that there might be no function that agrees with the given finite number of terms. Of course there are many such functions.