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A044049 as a simple table

na(n)
00
10
21
37
431
5139
6609
72677
811827
952648
10236071
111065774
124841428
1322115678
14101531221
15468224323
162168076055
1710076177264
1846986612235
19219777649588
201030892581741
214848039893338
2222853638285655
23107970202258065

[0,0,1,7,31,139,609,2677,11827,52648,236071,
 1065774,4841428,22115678,101531221,468224323,
 2168076055,10076177264,46986612235,219777649588,
 1030892581741,4848039893338,22853638285655,
 107970202258065]