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A293032 as a simple table

na(n)
11
22
36
420
587
6420
72254
812676
973819
10438795
112649555
1216217883
1399888892
14621428188
153893646748
1624548337096

[1,2,6,20,87,420,2254,12676,73819,438795,2649555,
 16217883,99888892,621428188,3893646748,
 24548337096]