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A099524 as a simple table

na(n)
01
15
225
3126
4635
53200
616126
781265
8409525
92063751
1010400020
1152409625
12264111876
131330959400
146707206625
1533800145001
16170331684405
17858365628650
184325628288251
1921798473125660
20109850731256950
21553579284573001

[1,5,25,126,635,3200,16126,81265,409525,2063751,
 10400020,52409625,264111876,1330959400,6707206625,
 33800145001,170331684405,858365628650,
 4325628288251,21798473125660,109850731256950,
 553579284573001]