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A221145 as a simple table

na(n)
11
20
30
48
530
6144
71120
89120
980892
10808640
118908416
12106889760
131389405160
1419452003648
15291782125440
164668506495744
1779364583206160
181428562661736960
1927142690917071872
20542853814698737280
2111399930105272855776
22250798462399704792320

[1,0,0,8,30,144,1120,9120,80892,808640,8908416,
 106889760,1389405160,19452003648,291782125440,
 4668506495744,79364583206160,1428562661736960,
 27142690917071872,542853814698737280,
 11399930105272855776,250798462399704792320]