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A020522 as a simple table

n a(n)
0 0
1 2
2 12
3 56
4 240
5 992
6 4032
7 16256
8 65280
9 261632
10 1047552
11 4192256
12 16773120
13 67100672
14 268419072
15 1073709056
16 4294901760
17 17179738112
18 68719214592
19 274877382656
20 1099510579200
21 4398044413952
22 17592181850112
23 70368735789056
24 281474959933440

[0,2,12,56,240,992,4032,16256,65280,261632,
 1047552,4192256,16773120,67100672,268419072,
 1073709056,4294901760,17179738112,68719214592,
 274877382656,1099510579200,4398044413952,
 17592181850112,70368735789056,281474959933440]

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Last modified August 25 16:17 EDT 2019. Contains 326324 sequences. (Running on oeis4.)