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A006974 as a simple table

na(n)
01
19
250
3220
4840
52912
69408
728800
884480
9239360
10658944
111770496
124659200
1312042240
1430638080
1576873728
16190513152
17466944000
181133117440
192724986880
206499598336
2115386804224
2236175872000
2384515225600
24196293427200
25453437816832

[1,9,50,220,840,2912,9408,28800,84480,239360,
 658944,1770496,4659200,12042240,30638080,76873728,
 190513152,466944000,1133117440,2724986880,
 6499598336,15386804224,36175872000,84515225600,
 196293427200,453437816832]