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A281654 as a simple table

n a(n)
1 0
2 4
3 70
4 400
5 2128
6 10512
7 49352
8 225024
9 1003104
10 4395200
11 19006304
12 81319168
13 344886784
14 1452055808
15 6075680384
16 25286555648
17 104754555392
18 432208419840
19 1776869555712
20 7281672187904
21 29755307585536
22 121277018935296

[0,4,70,400,2128,10512,49352,225024,1003104,
 4395200,19006304,81319168,344886784,1452055808,
 6075680384,25286555648,104754555392,432208419840,
 1776869555712,7281672187904,29755307585536,
 121277018935296]

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Last modified April 20 00:26 EDT 2024. Contains 371798 sequences. (Running on oeis4.)