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A055897 as a simple table

n a(n)
1 1
2 2
3 12
4 108
5 1280
6 18750
7 326592
8 6588344
9 150994944
10 3874204890
11 110000000000
12 3423740047332
13 115909305827328
14 4240251492291542
15 166680102383370240
16 7006302246093750000
17 313594649253062377472
18 14890324713954061755186
19 747581753430634213933056

[1,2,12,108,1280,18750,326592,6588344,150994944,
 3874204890,110000000000,3423740047332,
 115909305827328,4240251492291542,
 166680102383370240,7006302246093750000,
 313594649253062377472,14890324713954061755186,
 747581753430634213933056]

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Last modified July 23 16:14 EDT 2019. Contains 325258 sequences. (Running on oeis4.)