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A158540 as a simple table

na(n)
121
287
3197
4351
5549
6791
71077
81407
91781
102199
112661
123167
133717
144311
154949
165631
176357
187127
197941
208799
219701
2210647
2311637
2412671
2513749
2614871
2716037
2817247
2918501
3019799
3121141
3222527
3323957
3425431
3526949
3628511
3730117
3831767
3933461
4035199
4136981
4238807

[21,87,197,351,549,791,1077,1407,1781,2199,2661,
 3167,3717,4311,4949,5631,6357,7127,7941,8799,9701,
 10647,11637,12671,13749,14871,16037,17247,18501,
 19799,21141,22527,23957,25431,26949,28511,30117,
 31767,33461,35199,36981,38807]