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A188509 as a simple table

na(n)
11
21
33
41
55
67
71
89
913
1015
111
1217
1325
1429
1531
161
1733
1849
1957
2061
2163
221
2365

[1,1,3,1,5,7,1,9,13,15,1,17,25,29,31,1,33,49,57,
 61,63,1,65]