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A368048 as a simple table

na(n)
01
13
236
3540
46480
5136080
68164800
724494400
8293932800
948498912000
104073908608000
11158882435712000
129532946142720000
1328598838428160000
14343186061137920000
15612587119131187200000
167351045429574246400000
17419009589485732044800000
18276546329060583149568000000

[1,3,36,540,6480,136080,8164800,24494400,
 293932800,48498912000,4073908608000,
 158882435712000,9532946142720000,
 28598838428160000,343186061137920000,
 612587119131187200000,7351045429574246400000,
 419009589485732044800000,
 276546329060583149568000000]