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A028678 as a simple table

na(n)
01
1240
215667200
3262787825664000
41128647894950886768640000
51240960300690310266540982796288000000
6349299250915794737048265419604885133559070720000000

[1,240,15667200,262787825664000,
 1128647894950886768640000,
 1240960300690310266540982796288000000,
 34929925091579473704826541960488513355907072000000\
 0]