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A290621 as a simple table

n a(n)
0 1
1 1
2 7
3 15
4 7
5 63
6 63
7 255
8 511
9 1023
10 127
11 4095
12 255
13 16383
14 2047
15 65535
16 12799
17 262143
18 102399
19 1048575
20 1015807
21 4194303
22 8388607
23 16777215
24 16515071
25 67108863
26 33357823
27 268435455
28 7995391
29 1073741823
30 4194303
31 4294967295
32 16252927
33 17179869183

[1,1,7,15,7,63,63,255,511,1023,127,4095,255,16383,
 2047,65535,12799,262143,102399,1048575,1015807,
 4194303,8388607,16777215,16515071,67108863,
 33357823,268435455,7995391,1073741823,4194303,
 4294967295,16252927,17179869183]

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Last modified December 7 00:16 EST 2019. Contains 329812 sequences. (Running on oeis4.)