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A180112 as a simple table

na(n)
21
33
411
557
6360
72428
819692
9178096
101814400
1119748160
12237351468
133091307829
1443589145600
15650470873262
1610415387654044
17177171175431551
183201186852864000
1960647963017860105
201213361365706836584
2125488014447816087399
22562000363888803840000

[1,3,11,57,360,2428,19692,178096,1814400,19748160,
 237351468,3091307829,43589145600,650470873262,
 10415387654044,177171175431551,3201186852864000,
 60647963017860105,1213361365706836584,
 25488014447816087399,562000363888803840000]