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A125839 as a simple table

na(n)
31
41
56
618
7120
81260
91485540
1028667100
1128667100
12842889105240
132281585556250
14163881570370980
1545187548280664790

[1,1,6,18,120,1260,1485540,28667100,28667100,
 842889105240,2281585556250,163881570370980,
 45187548280664790]