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A147207 as a simple table

na(n)
11
21
31
41
51
61
71
813
937
1065
11115
12397
131335
144065
1516853
1683455
17458373
182464107
1913365801
2084069939
21594053347

[1,1,1,1,1,1,1,13,37,65,115,397,1335,4065,16853,
 83455,458373,2464107,13365801,84069939,594053347]