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A018844 as a simple table

na(n)
14
210
352
4724
5970
610084
795050
8140452
91956244
109313930
1127246964
12379501252
13912670090
145285770564
1573621286644
1689432354890
171025412242452
188763458109130
1914282150107684
20198924689265124

[4,10,52,724,970,10084,95050,140452,1956244,
 9313930,27246964,379501252,912670090,5285770564,
 73621286644,89432354890,1025412242452,
 8763458109130,14282150107684,198924689265124]