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A003920 as a simple table

na(n)
124
251840
39170703360
4131569513308979200
5152915585868239728626892800
614395932257291877030764312963579904000
7109777561863482259035023554842176139436811616256000

[24,51840,9170703360,131569513308979200,
 152915585868239728626892800,
 14395932257291877030764312963579904000,
 10977756186348225903502355484217613943681161625600\
 0]