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A002493 as a simple table

n a(n)
1 1
2 0
3 0
4 0
5 10
6 60
7 462
8 3920
9 36954
10 382740
11 4327510
12 53088888
13 702756210
14 9988248956
15 151751644590
16 2454798429600
17 42130249479562
18 764681923900260
19 14636063499474054
20 294639009867223880

[1,0,0,0,10,60,462,3920,36954,382740,4327510,
 53088888,702756210,9988248956,151751644590,
 2454798429600,42130249479562,764681923900260,
 14636063499474054,294639009867223880]

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Last modified January 20 17:20 EST 2018. Contains 297960 sequences.