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A287261 as a simple table

na(n)
01
11
21
31
440864828320
57792009289281728000
6187746872107299580970294400000
7614005731326101652800803825889630961295360
8176445174659483893854948844253232539237396497554309120000
97090469783239448892319287907564531885316857076509137838529329991091840000

[1,1,1,1,40864828320,7792009289281728000,
 187746872107299580970294400000,
 614005731326101652800803825889630961295360,
 17644517465948389385494884425323253923739649755430\
 9120000,
 70904697832394488923192879075645318853168570765091\
 37838529329991091840000]