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A228734 as a simple table

na(n)
13
29
327
477
5185
6447
71071
82593
96333
1015513
1138039
1293213
13228279
14558849
151367945
163348489
178196847
1820065943
1949122291
20120253773
21294386457
22720668887
231764221329
244318870217
2510572732933
2625882394413
2763360952825
28155109705901

[3,9,27,77,185,447,1071,2593,6333,15513,38039,
 93213,228279,558849,1367945,3348489,8196847,
 20065943,49122291,120253773,294386457,720668887,
 1764221329,4318870217,10572732933,25882394413,
 63360952825,155109705901]