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A050982 as a simple table

na(n)
51
630
7525
87000
978750
10787500
117218750
1261875000
13502734375
143910156250
1529326171875
16213281250000
171510742187500
1810458984375000
1970971679687500
20473144531250000
213105010986328125
2220091247558593750
23128360748291015625
24810699462890625000

[1,30,525,7000,78750,787500,7218750,61875000,
 502734375,3910156250,29326171875,213281250000,
 1510742187500,10458984375000,70971679687500,
 473144531250000,3105010986328125,
 20091247558593750,128360748291015625,
 810699462890625000]