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A146466 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
137
147
1521
1621
1755
1855
19263
20263
211645
221645
2313423
2413423

[1,1,1,1,1,1,1,1,1,1,1,1,7,7,21,21,55,55,263,263,
 1645,1645,13423,13423]