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A142988 as a simple table

n a(n)
1 1
2 3
3 17
4 96
5 696
6 5448
7 49752
8 492480
9 5457600
10 65128320
11 850296960
12 11864240640
13 178442611200
14 2848854758400
15 48517709184000
16 872011090944000
17 16589133517824000
18 331426982928384000
19 6966369015201792000

[1,3,17,96,696,5448,49752,492480,5457600,65128320,
 850296960,11864240640,178442611200,2848854758400,
 48517709184000,872011090944000,16589133517824000,
 331426982928384000,6966369015201792000]

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Last modified May 17 00:16 EDT 2021. Contains 343957 sequences. (Running on oeis4.)