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A081067 as a simple table

na(n)
05
120
2125
3845
45780
539605
6271445
71860500
812752045
987403805
10599074580
114106118245
1228143753125
13192900153620
141322157322205
159062201101805
1662113250390420
17425730551631125
182918000611027445
1920000273725560980

[5,20,125,845,5780,39605,271445,1860500,12752045,
 87403805,599074580,4106118245,28143753125,
 192900153620,1322157322205,9062201101805,
 62113250390420,425730551631125,2918000611027445,
 20000273725560980]