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A173794 as a simple table

na(n)
01
13
27
321
478
5390
62461
717491
8135226
91103076
109371892
1182205622
12740254762
136814312822
1463920746639
15609452784251
165894288690288
1757728196873452
18571747727911362
195719672404523644
2057737110684330278
21587604181217075742

[1,3,7,21,78,390,2461,17491,135226,1103076,
 9371892,82205622,740254762,6814312822,63920746639,
 609452784251,5894288690288,57728196873452,
 571747727911362,5719672404523644,
 57737110684330278,587604181217075742]