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A366639 as a simple table

na(n)
01
14
220
3168
41200
57600
643200
7407680
82712832
919707408
10112560000
11945677920
126768230400
1347530457728
14271289229120
152096760960000
1616569393144832
17116315256993600
18597938524646400
195699431359135360
2038890647857280000
21270061302781670400

[1,4,20,168,1200,7600,43200,407680,2712832,
 19707408,112560000,945677920,6768230400,
 47530457728,271289229120,2096760960000,
 16569393144832,116315256993600,597938524646400,
 5699431359135360,38890647857280000,
 270061302781670400]