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A173499 as a simple table

n a(n)
1 0
2 0
3 2
4 20
5 204
6 2604
7 39990
8 720600
9 14913080
10 348678440
11 9090909090
12 261535698060
13 8230246567620
14 281241170407092
15 10371206370520814
16 410525522232055664
17 17361641481138401520
18 781282469559318055056

[0,0,2,20,204,2604,39990,720600,14913080,
 348678440,9090909090,261535698060,8230246567620,
 281241170407092,10371206370520814,
 410525522232055664,17361641481138401520,
 781282469559318055056]

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Last modified September 19 00:22 EDT 2021. Contains 347549 sequences. (Running on oeis4.)