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A163270 as a simple table

na(n)
11
21
31
43
51
63
73
813
91
103
113
1213
133
1413
1513
1675
171
183
193
2013
213
2213
2313
2475
253
2613
2713
2875
2913
3075
3175
32541

[1,1,1,3,1,3,3,13,1,3,3,13,3,13,13,75,1,3,3,13,3,
 13,13,75,3,13,13,75,13,75,75,541]