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A005491 as a simple table

na(n)
01
15
215
337
477
5141
6235
7365
8537
9757
101031
111365
121765
132237
142787
153421
164145
174965
185887
196917
208061
219325
2210715
2312237
2413897
2515701
2617655
2719765
2822037
2924477
3027091
3129885
3232865
3336037
3439407
3542981
3646765
3750765
3854987
3959437
4064121
4169045

[1,5,15,37,77,141,235,365,537,757,1031,1365,1765,
 2237,2787,3421,4145,4965,5887,6917,8061,9325,
 10715,12237,13897,15701,17655,19765,22037,24477,
 27091,29885,32865,36037,39407,42981,46765,50765,
 54987,59437,64121,69045]