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A278968 as a simple table

na(n)
11
21
31
41
53
65
71
827
93
10565
111
127085
1325
143
1511
161266205
179099507
1817602325
19128207979
20119
211
2213

[1,1,1,1,3,5,1,27,3,565,1,7085,25,3,11,1266205,
 9099507,17602325,128207979,119,1,13]