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A063896 as a simple table

n a(n)
0 0
1 1
2 1
3 3
4 7
5 31
6 255
7 8191
8 2097151
9 17179869183
10 36028797018963967
11 618970019642690137449562111
12 22300745198530623141535718272648361505980415

[0,1,1,3,7,31,255,8191,2097151,17179869183,
 36028797018963967,618970019642690137449562111,
 22300745198530623141535718272648361505980415]

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Last modified April 16 23:40 EDT 2021. Contains 343051 sequences. (Running on oeis4.)