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A188504 as a simple table

na(n)
121
2441
34351
435079
5317751
63121877
730288308
8288040928
92737303569
1026117921403
11249374820339
122379330844064
1322697020589721
14216539527325714
152065979971938958
1619710827779239843
17188052454261718490

[21,441,4351,35079,317751,3121877,30288308,
 288040928,2737303569,26117921403,249374820339,
 2379330844064,22697020589721,216539527325714,
 2065979971938958,19710827779239843,
 188052454261718490]