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A046989 as a simple table

na(n)
01
16
2180
32835
437800
5467775
63831077250
7127702575
82605132530000
9350813659321125
1015313294652906250
11147926426347074375
122423034863565078262500
13144228265688397515625
143952575621190533915703125
1584913182070036240111050234375
16999843529136357459316262500000

[1,6,180,2835,37800,467775,3831077250,127702575,
 2605132530000,350813659321125,15313294652906250,
 147926426347074375,2423034863565078262500,
 144228265688397515625,3952575621190533915703125,
 84913182070036240111050234375,
 999843529136357459316262500000]