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A271791 as a simple table

na(n)
40
51
615
7129
8891
95611
1034213
11208230
121285094
138108722
1452540098
15350375379
162407395908
1717048774736
18124435165429
19935736058614
207246161094614
2157749473020305
22473358586652328
233987856784525223
2434506189729577186
25306454001139880689
262791593349164080381

[0,1,15,129,891,5611,34213,208230,1285094,8108722,
 52540098,350375379,2407395908,17048774736,
 124435165429,935736058614,7246161094614,
 57749473020305,473358586652328,3987856784525223,
 34506189729577186,306454001139880689,
 2791593349164080381]