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A177882 as a simple table

n a(n)
0 1
1 15
2 85
3 771
4 4369
5 65535
6 327685
7 3342387
8 16843009
9 252645135
10 1431655765
11 12884901891
12 73014444049
13 1095216660735
14 5519032976645
15 56294136361779
16 281479271743489
17 4222189076152335
18 23925738098196565

[1,15,85,771,4369,65535,327685,3342387,16843009,
 252645135,1431655765,12884901891,73014444049,
 1095216660735,5519032976645,56294136361779,
 281479271743489,4222189076152335,
 23925738098196565]

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Last modified February 20 15:04 EST 2019. Contains 320327 sequences. (Running on oeis4.)