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A147895 as a simple table

na(n)
11
22
36
424
596
6456
72134
812418
981178
10625138
114275412
1232681806
13305356674
143193552544
1529875677830
16301075498104

[1,2,6,24,96,456,2134,12418,81178,625138,4275412,
 32681806,305356674,3193552544,29875677830,
 301075498104]