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A123890 as a simple table

na(n)
01
15
225
3115
4525
52385
610825
749120
8222875
91011251
104588335
1120818575
1294459755
13428590575
141944636420
158823364350
1640034094615
17181645987625
18824179118751
193739533301365
2016967318139775
2176985511735170
22349304997307275
231584895370489480

[1,5,25,115,525,2385,10825,49120,222875,1011251,
 4588335,20818575,94459755,428590575,1944636420,
 8823364350,40034094615,181645987625,824179118751,
 3739533301365,16967318139775,76985511735170,
 349304997307275,1584895370489480]