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A006549 as a simple table

n a(n)
1 1
2 2
3 3
4 4
5 7
6 8
7 16
8 31
9 127
10 256
11 8191
12 65536
13 131071
14 524287
15 2147483647
16 2305843009213693951
17 618970019642690137449562111
18 162259276829213363391578010288127
19 170141183460469231731687303715884105727

[1,2,3,4,7,8,16,31,127,256,8191,65536,131071,
 524287,2147483647,2305843009213693951,
 618970019642690137449562111,
 162259276829213363391578010288127,
 170141183460469231731687303715884105727]

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Last modified February 17 23:35 EST 2020. Contains 332006 sequences. (Running on oeis4.)