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A283951 as a simple table

n a(n)
1 0
2 0
3 2
4 16
5 84
6 408
7 1926
8 8776
9 38912
10 169456
11 727914
12 3091712
13 13010668
14 54334792
15 225449486
16 930278584
17 3820249240
18 15622389664
19 63649588850
20 258473068912
21 1046543827972
22 4226200851704
23 17025631341974
24 68440231400232

[0,0,2,16,84,408,1926,8776,38912,169456,727914,
 3091712,13010668,54334792,225449486,930278584,
 3820249240,15622389664,63649588850,258473068912,
 1046543827972,4226200851704,17025631341974,
 68440231400232]

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Last modified January 21 22:08 EST 2022. Contains 350480 sequences. (Running on oeis4.)