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A146740 as a simple table

na(n)
11
21
31
41
51
61
71
81
925
1025
11197
12197
131317
141317
1527967
1627967
17769895
18769895
1931824755
2031824755
212225324253
222225324253

[1,1,1,1,1,1,1,1,25,25,197,197,1317,1317,27967,
 27967,769895,769895,31824755,31824755,2225324253,
 2225324253]