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A003807 as a simple table

na(n)
1168
25616
320160
4372000
51876896
616482816
742456960
8212427600
9270178272
101425715200
116950204928
125644682640
1378156525216
1450778000000
15282027786768
16499631102880
17283991644800
181098404364288

[168,5616,20160,372000,1876896,16482816,42456960,
 212427600,270178272,1425715200,6950204928,
 5644682640,78156525216,50778000000,282027786768,
 499631102880,283991644800,1098404364288]