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A073965 as a simple table

na(n)
10
20
36
430
5150
6650
73150
815500
978000
10390000
111952500
129762500
1348831250
14244156250
151220781250
166103593750
1730517656250
18152587500000
19762939062500
203814695312500
2119073484375000
2295367421875000
23476837167968750
242384185839843750
2511920929199218750

[0,0,6,30,150,650,3150,15500,78000,390000,1952500,
 9762500,48831250,244156250,1220781250,6103593750,
 30517656250,152587500000,762939062500,
 3814695312500,19073484375000,95367421875000,
 476837167968750,2384185839843750,
 11920929199218750]