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A109926 as a simple table

na(n)
01
13
24
315
421
545
675
7465
81095
92145
104935
1114955
1280685
13229845
141295325
151575285
169700575
1720435415
1815054105
1953999715
202282745465

[1,3,4,15,21,45,75,465,1095,2145,4935,14955,80685,
 229845,1295325,1575285,9700575,20435415,15054105,
 53999715,2282745465]