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A068194 as a simple table

n a(n)
1 1
2 2
3 3
4 4
5 7
6 16
7 31
8 127
9 256
10 8191
11 65536
12 131071
13 524287
14 2147483647
15 2305843009213693951
16 618970019642690137449562111
17 162259276829213363391578010288127
18 170141183460469231731687303715884105727

[1,2,3,4,7,16,31,127,256,8191,65536,131071,524287,
 2147483647,2305843009213693951,
 618970019642690137449562111,
 162259276829213363391578010288127,
 170141183460469231731687303715884105727]

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Last modified June 7 01:26 EDT 2020. Contains 334836 sequences. (Running on oeis4.)