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A140864 as a simple table

na(n)
11
23
39
415
545
6105
7315
8945
92835
103465
1110395
1231185
1345045
14135135
15405405
16675675
172027025
183828825
1911486475
2034459425
2172747675
22218243025
23654729075
241527701175
254583103525
2611712375675
2735137127025
28105411381075

[1,3,9,15,45,105,315,945,2835,3465,10395,31185,
 45045,135135,405405,675675,2027025,3828825,
 11486475,34459425,72747675,218243025,654729075,
 1527701175,4583103525,11712375675,35137127025,
 105411381075]