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A273345 as a simple table

na(n)
20
31
42
57
623
775
8245
9801
102622
118595
1228215
1392751
14305304
151006207
163320071
1710966741
1836261414
19120010103
20397528422
211317860989
224372180109
2314515485973
2448222552640
25160300772873
26533176676911
271774359032599
285907894024527
2919680307851415
3065588436120988
31218679463049627

[0,1,2,7,23,75,245,801,2622,8595,28215,92751,
 305304,1006207,3320071,10966741,36261414,
 120010103,397528422,1317860989,4372180109,
 14515485973,48222552640,160300772873,533176676911,
 1774359032599,5907894024527,19680307851415,
 65588436120988,218679463049627]