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A177946 as a simple table

na(n)
12
23
320
4210
5332640
68648640
770572902400
83016991577600
971241227785728000
102436552577639909048320000
11205999445200465037721600000
1228734252852655074735274328064000000
135372155913332392772506888374845440000000

[2,3,20,210,332640,8648640,70572902400,
 3016991577600,71241227785728000,
 2436552577639909048320000,
 205999445200465037721600000,
 28734252852655074735274328064000000,
 5372155913332392772506888374845440000000]