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A176475 as a simple table

na(n)
10
21
32
48
524
6136
7960
85312
940320
10491776
114112640
1240270592
13638668800
146249389056
1591883151360
161919826163712
1720922789888000
18355897293438976
198676514912665600
20121674189293944832
212757288942600192000

[0,1,2,8,24,136,960,5312,40320,491776,4112640,
 40270592,638668800,6249389056,91883151360,
 1919826163712,20922789888000,355897293438976,
 8676514912665600,121674189293944832,
 2757288942600192000]