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A122749 as a simple table

n a(n)
2 4
3 2
4 16
5 44
6 256
7 768
8 5184
9 25344
10 186624
11 996480
12 8294400
13 57888000
14 530841600
15 4006195200
16 40642560000
17 367408742400
18 4064256000000
19 39358255104000
20 474054819840000
21 5254107586560000
22 68263894056960000
23 804207665479680000
24 11242684107325440000

[4,2,16,44,256,768,5184,25344,186624,996480,
 8294400,57888000,530841600,4006195200,40642560000,
 367408742400,4064256000000,39358255104000,
 474054819840000,5254107586560000,
 68263894056960000,804207665479680000,
 11242684107325440000]

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Last modified October 15 05:43 EDT 2019. Contains 328026 sequences. (Running on oeis4.)