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A275539 as a simple table

na(n)
01
12
24
312
436
5160
6810
75376
841160
9366336
103638250
1139959040
12479126340
136227619840
1487180183090
151307684044800
1620922822320400
17355687603568640
186402374325997650
19121645103938928640
202432902021271221500
2151090942249743155200
221124000728080092512650

[1,2,4,12,36,160,810,5376,41160,366336,3638250,
 39959040,479126340,6227619840,87180183090,
 1307684044800,20922822320400,355687603568640,
 6402374325997650,121645103938928640,
 2432902021271221500,51090942249743155200,
 1124000728080092512650]