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A073963 as a simple table

na(n)
11
21
31
425
5125
6625
73025
815625
978625
10393125
111955625
129765625
1348815625
14244140625
151220703125
166103515625
1730517265625
18152587890625
19762941015625
203814705078125
2119073494140625
2295367431640625
23476837119140625
242384185791015625
2511920928955078125

[1,1,1,25,125,625,3025,15625,78625,393125,1955625,
 9765625,48815625,244140625,1220703125,6103515625,
 30517265625,152587890625,762941015625,
 3814705078125,19073494140625,95367431640625,
 476837119140625,2384185791015625,
 11920928955078125]