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A147915 as a simple table

na(n)
11
22
36
424
596
6444
72508
813216
974772
10490758
113432594
1229784866
13218746780
141711675050
1514763495624
16145575514096

[1,2,6,24,96,444,2508,13216,74772,490758,3432594,
 29784866,218746780,1711675050,14763495624,
 145575514096]