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A183686 as a simple table

na(n)
1384
23472
328160
4239424
51992320
616748160
7140090240
81174759296
99838208512
1082449830016
11690711971456
125787565930752
1348489078457728
14406275347589248
153403932556101120
1628520064001053824
17238954333647573120

[384,3472,28160,239424,1992320,16748160,140090240,
 1174759296,9838208512,82449830016,690711971456,
 5787565930752,48489078457728,406275347589248,
 3403932556101120,28520064001053824,
 238954333647573120]