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A039717 as a simple table

na(n)
11
24
315
455
5200
6725
72625
89500
934375
10124375
11450000
121628125
135890625
1421312500
1577109375
16278984375
171009375000
183651953125
1913212890625
2047804687500
21172958984375
22625771484375
232264062500000
248191455078125

[1,4,15,55,200,725,2625,9500,34375,124375,450000,
 1628125,5890625,21312500,77109375,278984375,
 1009375000,3651953125,13212890625,47804687500,
 172958984375,625771484375,2264062500000,
 8191455078125]