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A179716 as a simple table

na(n)
20
36
424
590
6360
71680
87840
936960
10184800
11924000
124643100
1324144120
14125621496
15655350696
163495203712

[0,6,24,90,360,1680,7840,36960,184800,924000,
 4643100,24144120,125621496,655350696,3495203712]