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A081571 as a simple table

na(n)
01
17
250
3363
42669
519814
6148153
71113615
88402722
963577171
10481991621
113659227062
1227808295345
13211479529943
141609093780114
1512247558413819
1693245414394973
17710040492168070
185407464407991017
1941185377124992351
20313703861897268866
212389549742539808867

[1,7,50,363,2669,19814,148153,1113615,8402722,
 63577171,481991621,3659227062,27808295345,
 211479529943,1609093780114,12247558413819,
 93245414394973,710040492168070,5407464407991017,
 41185377124992351,313703861897268866,
 2389549742539808867]