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A253866 as a simple table

na(n)
120480
2288000
33939840
450414592
5659280384
68536982016
7111370158592
81445588517376
918809857917440
10244401967088128
113178205753000448
1241308041898770944
13537040145411359232
146980815424323469824

[20480,288000,3939840,50414592,659280384,
 8536982016,111370158592,1445588517376,
 18809857917440,244401967088128,3178205753000448,
 41308041898770944,537040145411359232,
 6980815424323469824]