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A073966 as a simple table

na(n)
11
22
36
420
5125
6625
73150
815500
978000
10390625
111955625
129768750
1348831250
14244125000
151220703125
166103515625
1730517656250
18152587500000
19762939062500
203814697265625
2119073494140625
2295367441406250
23476837167968750
242384185742187500
2511920928955078125

[1,2,6,20,125,625,3150,15500,78000,390625,1955625,
 9768750,48831250,244125000,1220703125,6103515625,
 30517656250,152587500000,762939062500,
 3814697265625,19073494140625,95367441406250,
 476837167968750,2384185742187500,
 11920928955078125]