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A033957 as a simple table

na(n)
13
24
36
46
56
66
76
810
98
108
1110
126
136
1410
1512
168
178
1810
196
208
2110
2210
2314
2412
256
266
276
286
2918
3018

[3,4,6,6,6,6,6,10,8,8,10,6,6,10,12,8,8,10,6,8,10,
 10,14,12,6,6,6,6,18,18]