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A173500 as a simple table

n a(n)
1 0
2 0
3 0
4 6
5 64
6 854
7 13392
8 244944
9 5124266
10 120795956
11 3169804000
12 91666666668
13 2897010809280
14 99350833566282
15 3674884626652666
16 145845089585448960
17 6182031393612132352
18 278750799336055446646
19 13322922112485213149376

[0,0,0,6,64,854,13392,244944,5124266,120795956,
 3169804000,91666666668,2897010809280,
 99350833566282,3674884626652666,
 145845089585448960,6182031393612132352,
 278750799336055446646,13322922112485213149376]

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Last modified October 16 20:36 EDT 2021. Contains 348047 sequences. (Running on oeis4.)