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A166583 as a simple table

na(n)
01
115
2210
32940
441160
5576240
68067360
7112943040
81581202560
922136835840
10309915701760
114338819824640
1260743477544855
13850408685626500
1411905721598750525
15166680102382220700
162333521433347076700

[1,15,210,2940,41160,576240,8067360,112943040,
 1581202560,22136835840,309915701760,4338819824640,
 60743477544855,850408685626500,11905721598750525,
 166680102382220700,2333521433347076700]