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A063858 as a simple table

na(n)
21
31
43
51
65
78
81
97
1027
1146
121
139
1471
151063
16790
171
1811
19156
2044956
211434219
2237829
231
2413
25325

[1,1,3,1,5,8,1,7,27,46,1,9,71,1063,790,1,11,156,
 44956,1434219,37829,1,13,325]