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A176473 as a simple table

na(n)
10
21
32
45
524
6121
7600
85039
940320
10302401
113659040
1239916799
13399168000
146227020801
1587160993920
161100625926399
1720922789888000
18355687428096001
195335329064665600
20121645100408831999
212453176191578112000

[0,1,2,5,24,121,600,5039,40320,302401,3659040,
 39916799,399168000,6227020801,87160993920,
 1100625926399,20922789888000,355687428096001,
 5335329064665600,121645100408831999,
 2453176191578112000]