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A073969 as a simple table

na(n)
10
22
36
430
5125
6650
73150
815750
978000
10390625
111952500
129768750
1348831250
14244156250
151220703125
166103593750
1730517656250
18152588281250
19762939062500
203814697265625
2119073484375000
2295367441406250
23476837167968750
242384185839843750
2511920928955078125

[0,2,6,30,125,650,3150,15750,78000,390625,1952500,
 9768750,48831250,244156250,1220703125,6103593750,
 30517656250,152588281250,762939062500,
 3814697265625,19073484375000,95367441406250,
 476837167968750,2384185839843750,
 11920928955078125]