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A173469 as a simple table

na(n)
21
32
45
516
662
7280
81440
98296
1052864
11368848
122794864
1322842048
14200201408
151872466944
1618608903968
17195778297664
182173272774016
1925380361760000
20311011886153856
213989579297299712
2253458990592638976
23746817531317769728

[1,2,5,16,62,280,1440,8296,52864,368848,2794864,
 22842048,200201408,1872466944,18608903968,
 195778297664,2173272774016,25380361760000,
 311011886153856,3989579297299712,
 53458990592638976,746817531317769728]