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A175671 as a simple table

na(n)
01
16
220
3567
43240
5155925
68292375
7147349125
8312615903600
9103180488035625
10769328200265625
11316985199315159375
128682638068197843750
13165206922515800790625
14527010082825404522093750
1539040543480476432234965625
1633712429605969723121012500000
171968441947987203748028891796875

[1,6,20,567,3240,155925,8292375,147349125,
 312615903600,103180488035625,769328200265625,
 316985199315159375,8682638068197843750,
 165206922515800790625,527010082825404522093750,
 39040543480476432234965625,
 33712429605969723121012500000,
 1968441947987203748028891796875]