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A147914 as a simple table

na(n)
11
22
36
416
574
6384
71970
810282
965472
10391386
112939090
1220208896
13147099900
141225118562
159901118700
1697592995386

[1,2,6,16,74,384,1970,10282,65472,391386,2939090,
 20208896,147099900,1225118562,9901118700,
 97592995386]