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A147288 as a simple table

na(n)
11
21
31
41
55
613
729
8101
9617
103357
1120865
12140793
131290919
1415614005
15229745285
163898534669

[1,1,1,1,5,13,29,101,617,3357,20865,140793,
 1290919,15614005,229745285,3898534669]