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A115618 as a simple table

n a(n)
0 4
1 8
2 17
3 37
4 81
5 177
6 385
7 833
8 1793
9 3841
10 8193
11 17409
12 36865
13 77825
14 163841
15 344065
16 720897
17 1507329
18 3145729
19 6553601
20 13631489
21 28311553
22 58720257
23 121634817
24 251658241
25 520093697
26 1073741825
27 2214592513
28 4563402753
29 9395240961
30 19327352833
31 39728447489

[4,8,17,37,81,177,385,833,1793,3841,8193,17409,
 36865,77825,163841,344065,720897,1507329,3145729,
 6553601,13631489,28311553,58720257,121634817,
 251658241,520093697,1073741825,2214592513,
 4563402753,9395240961,19327352833,39728447489]

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Last modified January 25 23:56 EST 2022. Contains 350572 sequences. (Running on oeis4.)