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A171338 as a simple table

na(n)
11
22
36
424
5104
6622
74324
834548
9310594
103164990
1135155038
12423974396
135541016736
1478238104000

[1,2,6,24,104,622,4324,34548,310594,3164990,
 35155038,423974396,5541016736,78238104000]