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A081993 as a simple table

na(n)
11
255
33330
45833350
511199999998880
6642096000000065520
784083999999999159160
8853092240000000006366360
921033492480000000001383782400
10181960466688000000000107035568640

[1,55,3330,5833350,11199999998880,
 642096000000065520,84083999999999159160,
 853092240000000006366360,
 21033492480000000001383782400,
 181960466688000000000107035568640]