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A006472 as a simple table

n a(n)
1 1
2 1
3 3
4 18
5 180
6 2700
7 56700
8 1587600
9 57153600
10 2571912000
11 141455160000
12 9336040560000
13 728211163680000
14 66267215894880000
15 6958057668962400000
16 834966920275488000000
17 113555501157466368000000
18 17373991677092354304000000
19 2970952576782792585984000000

[1,1,3,18,180,2700,56700,1587600,57153600,
 2571912000,141455160000,9336040560000,
 728211163680000,66267215894880000,
 6958057668962400000,834966920275488000000,
 113555501157466368000000,
 17373991677092354304000000,
 2970952576782792585984000000]

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Last modified October 16 17:10 EDT 2018. Contains 316271 sequences. (Running on oeis4.)