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A270855 as a simple table

na(n)
10
20
328440
427582438
55805948474
6571228600932
729999932959600
81131964246928502
927738553460278170
10526704152938743948
117209576736148583840
1280085435443327098104
13700902167873486650002

[0,0,28440,27582438,5805948474,571228600932,
 29999932959600,1131964246928502,27738553460278170,
 526704152938743948,7209576736148583840,
 80085435443327098104,700902167873486650002]