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A042209 as a simple table

na(n)
01
110
2501
35020
4251501
52520030
6126253001
71265050040
863378755001
9635052600050
1031816008757501
11318795140175060
1215971573017510501
13160034525315280070
148017697838781514001
1580337012913130420080
164024868343495302518001
1740329020447866155600090

[1,10,501,5020,251501,2520030,126253001,
 1265050040,63378755001,635052600050,
 31816008757501,318795140175060,15971573017510501,
 160034525315280070,8017697838781514001,
 80337012913130420080,4024868343495302518001,
 40329020447866155600090]