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A001898 as a simple table

n a(n)
0 1
1 2
2 12
3 8
4 240
5 96
6 4032
7 1152
8 34560
9 7680
10 101376
11 18432
12 50319360
13 7741440
14 6635520
15 884736
16 451215360
17 53084160
18 42361159680
19 4459069440
20 1471492915200
21 140142182400
22 1758147379200
23 152882380800
24 417368899584000
25 33389511966720
26 15410543984640

[1,2,12,8,240,96,4032,1152,34560,7680,101376,
 18432,50319360,7741440,6635520,884736,451215360,
 53084160,42361159680,4459069440,1471492915200,
 140142182400,1758147379200,152882380800,
 417368899584000,33389511966720,15410543984640]

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Last modified April 23 09:35 EDT 2019. Contains 322385 sequences. (Running on oeis4.)