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A063506 as a simple table

n a(n)
1 3
2 4
3 6
4 8
5 16
6 40
7 128
8 512
9 2560
10 20480
11 212992
12 2949120
13 80216064
14 3019898880
15 130459631616
16 7827577896960
17 935134639423488
18 128247036263792640
19 22024291027701989376
20 7222873082376801484800
21 4118350906606118082969600

[3,4,6,8,16,40,128,512,2560,20480,212992,2949120,
 80216064,3019898880,130459631616,7827577896960,
 935134639423488,128247036263792640,
 22024291027701989376,7222873082376801484800,
 4118350906606118082969600]

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Last modified August 12 17:17 EDT 2020. Contains 336439 sequences. (Running on oeis4.)