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A001644 as a simple table

na(n)
03
11
23
37
411
521
639
771
8131
9241
10443
11815
121499
132757
145071
159327
1617155
1731553
1858035
19106743
20196331
21361109
22664183
231221623
242246915
254132721
267601259
2713980895
2825714875
2947297029
3086992799
31160004703
32294294531
33541292033
34995591267
351831177831

[3,1,3,7,11,21,39,71,131,241,443,815,1499,2757,
 5071,9327,17155,31553,58035,106743,196331,361109,
 664183,1221623,2246915,4132721,7601259,13980895,
 25714875,47297029,86992799,160004703,294294531,
 541292033,995591267,1831177831]