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A212739 as a simple table

n a(n)
0 0
1 1
2 15
3 511
4 65535
5 33554431
6 68719476735
7 562949953421311
8 18446744073709551615
9 2417851639229258349412351
10 1267650600228229401496703205375
11 2658455991569831745807614120560689151
12 22300745198530623141535718272648361505980415

[0,1,15,511,65535,33554431,68719476735,
 562949953421311,18446744073709551615,
 2417851639229258349412351,
 1267650600228229401496703205375,
 2658455991569831745807614120560689151,
 22300745198530623141535718272648361505980415]

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Last modified January 24 22:09 EST 2021. Contains 340414 sequences. (Running on oeis4.)