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A189847 as a simple table

na(n)
11
22
36
424
5120
6696
74572
834260
9290328
102751480
1128426056
12318900264
133874868280
1450813711808
15716309557440
1610721493269568

[1,2,6,24,120,696,4572,34260,290328,2751480,
 28426056,318900264,3874868280,50813711808,
 716309557440,10721493269568]