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A109975 as a simple table

n a(n)
0 1
1 2
2 4
3 9
4 20
5 44
6 96
7 208
8 448
9 960
10 2048
11 4352
12 9216
13 19456
14 40960
15 86016
16 180224
17 376832
18 786432
19 1638400
20 3407872
21 7077888
22 14680064
23 30408704
24 62914560
25 130023424
26 268435456
27 553648128
28 1140850688
29 2348810240

[1,2,4,9,20,44,96,208,448,960,2048,4352,9216,
 19456,40960,86016,180224,376832,786432,1638400,
 3407872,7077888,14680064,30408704,62914560,
 130023424,268435456,553648128,1140850688,
 2348810240]

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Last modified October 18 07:19 EDT 2019. Contains 328146 sequences. (Running on oeis4.)