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A081096 as a simple table

na(n)
01
10
21
32
46
540
6155
71050
87175
949000
10427140
113649800
1234634985
13359579220
143844835995
1544765971250
16546966720300
177013372766400
1895334357393275
191349949069418950
2020031683836289125
21310545507994221500
225003248923131208750
2383939793691225972500

[1,0,1,2,6,40,155,1050,7175,49000,427140,3649800,
 34634985,359579220,3844835995,44765971250,
 546966720300,7013372766400,95334357393275,
 1349949069418950,20031683836289125,
 310545507994221500,5003248923131208750,
 83939793691225972500]