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A004395 as a simple table

na(n)
01
11
21
32
46
518
672
7360
81800
910800
1075600
11529200
124233600
1338102400
14342921600
153429216000
1637721376000
17414935136000
184979221632000
1964729881216000
20841488455808000
2111780838381312000
22176712575719680000

[1,1,1,2,6,18,72,360,1800,10800,75600,529200,
 4233600,38102400,342921600,3429216000,37721376000,
 414935136000,4979221632000,64729881216000,
 841488455808000,11780838381312000,
 176712575719680000]