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A224476 as a simple table

na(n)
16
21
3251
43751
568751
6718751
79218751
824218751
974218751
108574218751
1113574218751
12663574218751
135163574218751
1430163574218751
15980163574218751
162480163574218751
1737480163574218751
18987480163574218751
19487480163574218751
2065487480163574218751

[6,1,251,3751,68751,718751,9218751,24218751,
 74218751,8574218751,13574218751,663574218751,
 5163574218751,30163574218751,980163574218751,
 2480163574218751,37480163574218751,
 987480163574218751,487480163574218751,
 65487480163574218751]