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A186364 as a simple table

na(n)
01
10
21
31
45
515
671
7341
81945
912135
1084091
11635281
125212085
1346091955
14437198711
154426839821
1647657861425
17543551916975
186546911178931
1983039587809961
201106307936885965
2115445529882517195
22225502102290364751
233436240674908121701
2454555087491802061705

[1,0,1,1,5,15,71,341,1945,12135,84091,635281,
 5212085,46091955,437198711,4426839821,47657861425,
 543551916975,6546911178931,83039587809961,
 1106307936885965,15445529882517195,
 225502102290364751,3436240674908121701,
 54555087491802061705]