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A271947 as a simple table

na(n)
01
15040
2439378587648000
322448266013011335649028997120000000
46844214664110424043644485692109939233534721371668480000000000000

[1,5040,439378587648000,
 22448266013011335649028997120000000,
 68442146641104240436444856921099392335347213716684\
 80000000000000]