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A340156 as a simple table

na(n)
21
31
43
51
65
78
81
97
1021
1119
121
139
1440
1579
1643
171
1811
1965
20205
21281
2294
231
2413
2596
26421
27991
28963
29201
301
3115
32133
33751
342569
354612
363217
37423
381
3917
40176
411219
425531
4315085
4420905
4510547
46880
471
4819
49225
501849
5110513
5239186
5386241
5492935
5534089
561815

[1,1,3,1,5,8,1,7,21,19,1,9,40,79,43,1,11,65,205,
 281,94,1,13,96,421,991,963,201,1,15,133,751,2569,
 4612,3217,423,1,17,176,1219,5531,15085,20905,
 10547,880,1,19,225,1849,10513,39186,86241,92935,
 34089,1815]