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A261898 as a simple table

na(n)
01
11
24
325
4210
52205
627720
7405405
86756750
9126351225
102618916300
1159580345825
121475759335050
1339529267903125
141138442915610000
1535078272337233125
161151392703775063750
1740106845848164720625
181477620636511331812500
1957405561728465240915625

[1,1,4,25,210,2205,27720,405405,6756750,126351225,
 2618916300,59580345825,1475759335050,
 39529267903125,1138442915610000,35078272337233125,
 1151392703775063750,40106845848164720625,
 1477620636511331812500,57405561728465240915625]