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A142986 as a simple table

n a(n)
1 1
2 8
3 70
4 656
5 6648
6 72864
7 862128
8 10977408
9 149892480
10 2187106560
11 33985025280
12 560578268160
13 9786290088960
14 180315565516800
15 3497645442816000
16 71256899266560000
17 1521414754578432000
18 33975929212194816000

[1,8,70,656,6648,72864,862128,10977408,149892480,
 2187106560,33985025280,560578268160,9786290088960,
 180315565516800,3497645442816000,
 71256899266560000,1521414754578432000,
 33975929212194816000]

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Last modified February 8 02:43 EST 2023. Contains 360133 sequences. (Running on oeis4.)