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A117641 as a simple table

na(n)
01
10
21
33
411
542
6167
7684
82867
912240
1053043
11232731
121031829
134615542
1420805081
1594410363
16430945739
171977366192
189115261211
1942195093993
20196060049129
21914110333422
224275222950221
2320051858039718
2494294269673861

[1,0,1,3,11,42,167,684,2867,12240,53043,232731,
 1031829,4615542,20805081,94410363,430945739,
 1977366192,9115261211,42195093993,196060049129,
 914110333422,4275222950221,20051858039718,
 94294269673861]