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A173774 as a simple table

na(n)
18
2120
33680
4144760
56427008
6306745824
715364514880
8796663553400
942395640372800
102302336805317120
11127078484504270208
127108177964254013920
13402042028998035350400
1422954860061516225396800

[8,120,3680,144760,6427008,306745824,15364514880,
 796663553400,42395640372800,2302336805317120,
 127078484504270208,7108177964254013920,
 402042028998035350400,22954860061516225396800]