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A162807 as a simple table

na(n)
01
121
2420
38190
4159600
53108210
660532290
71178845500
822957618110
9447091673490
108706955895400
11169564956368010
123302218915041690
1364309571936658300
141252406684472377910
1524390187277913766890

[1,21,420,8190,159600,3108210,60532290,1178845500,
 22957618110,447091673490,8706955895400,
 169564956368010,3302218915041690,
 64309571936658300,1252406684472377910,
 24390187277913766890]