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A088336 as a simple table

na(n)
01
11
21
33
418
590
6480
73360
827720
9249480
102479680
1127276480
12327650400
134259455200
1459623724160
15894355862400
1614309953257600
17243269205379200
184378836875212800
1983197900629043200
201663958347802150400
2134943125303845158400
22768748742605299456000

[1,1,1,3,18,90,480,3360,27720,249480,2479680,
 27276480,327650400,4259455200,59623724160,
 894355862400,14309953257600,243269205379200,
 4378836875212800,83197900629043200,
 1663958347802150400,34943125303845158400,
 768748742605299456000]