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A073967 as a simple table

na(n)
10
20
36
425
5125
6600
73150
815750
978625
10390625
111952500
129762500
1348831250
14244140625
151220703125
166103437500
1730517656250
18152588281250
19762941015625
203814697265625
2119073484375000
2295367421875000
23476837167968750
242384185791015625
2511920928955078125

[0,0,6,25,125,600,3150,15750,78625,390625,1952500,
 9762500,48831250,244140625,1220703125,6103437500,
 30517656250,152588281250,762941015625,
 3814697265625,19073484375000,95367421875000,
 476837167968750,2384185791015625,
 11920928955078125]