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A146695 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
113
123
139
149
1523
1623
1749
1849
19265
20265
211763
221763

[1,1,1,1,1,1,1,1,1,1,3,3,9,9,23,23,49,49,265,265,
 1763,1763]