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A337550 as a simple table

na(n)
18
20
324
464
5360
61728
78624
843776
9225216
101173280
116182704
1232905536
13176657000
14955629920
155204178360
1628509374976
17157005901896
18868756900608
194827586102216

[8,0,24,64,360,1728,8624,43776,225216,1173280,
 6182704,32905536,176657000,955629920,5204178360,
 28509374976,157005901896,868756900608,
 4827586102216]