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A126883 as a simple table

n a(n)
0 0
1 1
2 7
3 63
4 1023
5 32767
6 2097151
7 268435455
8 68719476735
9 35184372088831
10 36028797018963967
11 73786976294838206463
12 302231454903657293676543
13 2475880078570760549798248447
14 40564819207303340847894502572031
15 1329227995784915872903807060280344575 

[0,1,7,63,1023,32767,2097151,268435455,
 68719476735,35184372088831,36028797018963967,
 73786976294838206463,302231454903657293676543,
 2475880078570760549798248447,
 40564819207303340847894502572031,
 1329227995784915872903807060280344575]

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Last modified May 18 13:50 EDT 2024. Contains 372630 sequences. (Running on oeis4.)