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A006214 as a simple table

na(n)
00
15
232
3178
41024
56320
642272
7306448
82401024
920253440
10183194912
111769901568
1218198049024
13198465167360
142288729963552
1527831596812288
16355961301697024
174777174607790080
1867129052143388192
19985743987073220608
2015098811288386497024
21240833888369219993600

[0,5,32,178,1024,6320,42272,306448,2401024,
 20253440,183194912,1769901568,18198049024,
 198465167360,2288729963552,27831596812288,
 355961301697024,4777174607790080,
 67129052143388192,985743987073220608,
 15098811288386497024,240833888369219993600]