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A156589 as a simple table

n a(n)
0 -1
1 1
2 11
3 55
4 239
5 991
6 4031
7 16255
8 65279
9 261631
10 1047551
11 4192255
12 16773119
13 67100671
14 268419071
15 1073709055
16 4294901759
17 17179738111
18 68719214591
19 274877382655
20 1099510579199
21 4398044413951
22 17592181850111
23 70368735789055

[-1,1,11,55,239,991,4031,16255,65279,261631,
 1047551,4192255,16773119,67100671,268419071,
 1073709055,4294901759,17179738111,68719214591,
 274877382655,1099510579199,4398044413951,
 17592181850111,70368735789055]

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Last modified June 22 21:29 EDT 2021. Contains 345393 sequences. (Running on oeis4.)