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A175836 as a simple table

na(n)
11
23
312
472
5432
65184
741472
8497664
95971968
10107495424
111289945088
1230958682112
13433421549568
1410402117189632
15249650812551168
165991619501228032
17107849151022104576
183882569436795764736

[1,3,12,72,432,5184,41472,497664,5971968,
 107495424,1289945088,30958682112,433421549568,
 10402117189632,249650812551168,5991619501228032,
 107849151022104576,3882569436795764736]