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A047024 as a simple table

na(n)
21
32
43
57
638
766
8293
91144
105452
1122610
1289617
13370658
141495184
155933517
1623790663
1794871091
18376066283
191494417598
205930990794
2123487622433
2293066819110
23368664549287
241459293473323
255777177019563
2622871054333027

[1,2,3,7,38,66,293,1144,5452,22610,89617,370658,
 1495184,5933517,23790663,94871091,376066283,
 1494417598,5930990794,23487622433,93066819110,
 368664549287,1459293473323,5777177019563,
 22871054333027]