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A221663 as a simple table

n a(n)
1 2
2 12
3 48
4 256
5 856
6 4096
7 15872
8 65344
9 259584
10 1048576
11 4177632
12 16777216
13 67051520
14 268430336
15 1073479680
16 4294967296
17 17178580480
18 68719476736
19 274872664064
20 1099511513088
21 4398023442432
22 17592186044416
23 70368641459200

[2,12,48,256,856,4096,15872,65344,259584,1048576,
 4177632,16777216,67051520,268430336,1073479680,
 4294967296,17178580480,68719476736,274872664064,
 1099511513088,4398023442432,17592186044416,
 70368641459200]

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Last modified May 18 12:47 EDT 2022. Contains 353807 sequences. (Running on oeis4.)