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A123894 as a simple table

na(n)
01
15
225
3115
4525
52405
611025
750525
8231525
91060979
104862065
1122280875
12102104045
13467901065
142144199765
159825991725
1645028504525
17206347239279
18945605099381
194333321849875
2019857843661645
2191000384646845
22417017585036185
231911021221349165

[1,5,25,115,525,2405,11025,50525,231525,1060979,
 4862065,22280875,102104045,467901065,2144199765,
 9825991725,45028504525,206347239279,945605099381,
 4333321849875,19857843661645,91000384646845,
 417017585036185,1911021221349165]