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A325790
as a simple table
n
a(n)
0
1
1
1
2
2
3
6
4
16
5
100
6
492
7
1764
8
8592
9
71208
10
395520
11
1679480
12
9313128
13
72154030
14
420375872
15
1625653650
[1,1,2,6,16,100,492,1764,8592,71208,395520, 1679480,9313128,72154030,420375872,1625653650]