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A003518 as a simple table

n a(n)
3 1
4 8
5 44
6 208
7 910
8 3808
9 15504
10 62016
11 245157
12 961400
13 3749460
14 14567280
15 56448210
16 218349120
17 843621600
18 3257112960
19 12570420330
20 48507033744
21 187187399448
22 722477682080
23 2789279908316
24 10772391370048
25 41620603020640

[1,8,44,208,910,3808,15504,62016,245157,961400,
 3749460,14567280,56448210,218349120,843621600,
 3257112960,12570420330,48507033744,187187399448,
 722477682080,2789279908316,10772391370048,
 41620603020640]

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Last modified January 17 10:30 EST 2019. Contains 319218 sequences. (Running on oeis4.)