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A275971 as a simple table

na(n)
15
215
385
4165
5235
6485
71665
81885
94835
105765
117585
1215085
1315885
1416665
1518365
1618915
1722885
1827115
1927885
2050235
2157665
2258115
2372335
2485635
2587885
26150915
27166665
28182415
29194235
30194365
31229635
32240365
33268835
34503515
35507665
36524915
37568835
38570415
39577515
40581165

[5,15,85,165,235,485,1665,1885,4835,5765,7585,
 15085,15885,16665,18365,18915,22885,27115,27885,
 50235,57665,58115,72335,85635,87885,150915,166665,
 182415,194235,194365,229635,240365,268835,503515,
 507665,524915,568835,570415,577515,581165]