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A068251 as a simple table

na(n)
47
538960
611043135
7715016960
819498281250
9301435761312
103120392830170
1123965758136320
12146127409139745
13741378459250000
143237913809747617
1512485709312410880
1643342515673364180
17137520873034108480
18403684061693062500
191107133265664540672
202859892150083272715

[7,38960,11043135,715016960,19498281250,
 301435761312,3120392830170,23965758136320,
 146127409139745,741378459250000,3237913809747617,
 12485709312410880,43342515673364180,
 137520873034108480,403684061693062500,
 1107133265664540672,2859892150083272715]