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A049221 as a simple table

na(n)
11
20
31
44
514
646
7148
8474
91518
104864
1115590
1249974
13160196
14513522
151646134
165276800
1716915150
1854222686
19173814580
20557174698
211786062174
225725346304
2318352995094
2458831800038
25188589419748
26604536478850
271937883656166

[1,0,1,4,14,46,148,474,1518,4864,15590,49974,
 160196,513522,1646134,5276800,16915150,54222686,
 173814580,557174698,1786062174,5725346304,
 18352995094,58831800038,188589419748,604536478850,
 1937883656166]