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A052688 as a simple table

na(n)
00
11
22
36
448
5240
61440
715120
8120960
91088640
1014515200
11159667200
121916006400
1331135104000
14435891456000
156538371840000
16125536739328000
172134124568576000
1838414242234368000
19851515702861824000

[0,1,2,6,48,240,1440,15120,120960,1088640,
 14515200,159667200,1916006400,31135104000,
 435891456000,6538371840000,125536739328000,
 2134124568576000,38414242234368000,
 851515702861824000]