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A213215 as a simple table

n a(n)
1 3
2 7
3 15
4 27
5 27
6 127
7 255
8 511
9 1023
10 1819
11 4095
12 4255
13 16383
14 32767
15 65535
16 77671
17 262143
18 459759
19 1048575

[3,7,15,27,27,127,255,511,1023,1819,4095,4255,
 16383,32767,65535,77671,262143,459759,1048575]

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Last modified June 21 03:17 EDT 2021. Contains 345354 sequences. (Running on oeis4.)