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A147287 as a simple table

na(n)
11
21
31
41
51
61
71
81
925
1041
11113
12265
131045
142597
1510607
1634895
17213407
18913033
196860785
2033581603

[1,1,1,1,1,1,1,1,25,41,113,265,1045,2597,10607,
 34895,213407,913033,6860785,33581603]