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A081554 as a simple table

na(n)
00
18
248
3280
41632
59512
655440
7323128
81883328
910976840
1063977712
11372889432
122173358880
1312667263848
1473830224208
15430314081400
162508054264192
1714618011503752
1885200014758320
19496582077046168
202894292447518688

[0,8,48,280,1632,9512,55440,323128,1883328,
 10976840,63977712,372889432,2173358880,
 12667263848,73830224208,430314081400,
 2508054264192,14618011503752,85200014758320,
 496582077046168,2894292447518688]