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A006127 as a simple table

n a(n)
0 1
1 3
2 6
3 11
4 20
5 37
6 70
7 135
8 264
9 521
10 1034
11 2059
12 4108
13 8205
14 16398
15 32783
16 65552
17 131089
18 262162
19 524307
20 1048596
21 2097173
22 4194326
23 8388631
24 16777240
25 33554457
26 67108890
27 134217755
28 268435484
29 536870941
30 1073741854
31 2147483679
32 4294967328
33 8589934625

[1,3,6,11,20,37,70,135,264,521,1034,2059,4108,
 8205,16398,32783,65552,131089,262162,524307,
 1048596,2097173,4194326,8388631,16777240,33554457,
 67108890,134217755,268435484,536870941,1073741854,
 2147483679,4294967328,8589934625]

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Last modified November 22 18:55 EST 2019. Contains 329410 sequences. (Running on oeis4.)