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A047023 as a simple table

na(n)
11
21
34
45
519
666
7293
81144
94308
1017158
1167007
12258431
131012299
143955448
1515396192
1660225003
17235693679
18921621773
193610690891
2014157362951
2155517613242
22217923561656
23856025426013
243363897769426
2513227528604439

[1,1,4,5,19,66,293,1144,4308,17158,67007,258431,
 1012299,3955448,15396192,60225003,235693679,
 921621773,3610690891,14157362951,55517613242,
 217923561656,856025426013,3363897769426,
 13227528604439]