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A055070 as a simple table

na(n)
10
20
39
480
5900
612348
7200704
83779136
981000000
101948717100
1152027785216
121527047909712
1348884036690944
141695352148437500
1563331869759897600
162535571976423919872
17108321063231221415936
184918685157679434648876

[0,0,9,80,900,12348,200704,3779136,81000000,
 1948717100,52027785216,1527047909712,
 48884036690944,1695352148437500,63331869759897600,
 2535571976423919872,108321063231221415936,
 4918685157679434648876]