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A246921 as a simple table

na(n)
15
213
35
413
521
65
713
817
965
105
1113
1221
13165
14725
152805
165
1713
18445
191525
201853
215933
227925
2330629
245
2513
2617
2721
2865
29136
30288
31960
321260
334224
3416128
3521608
3683520
375
3813
393029
4010205
4111029
4212773
4328157
4434973
4542853
4647965
4753365
48136165
49184045

[5,13,5,13,21,5,13,17,65,5,13,21,165,725,2805,5,
 13,445,1525,1853,5933,7925,30629,5,13,17,21,65,
 136,288,960,1260,4224,16128,21608,83520,5,13,3029,
 10205,11029,12773,28157,34973,42853,47965,53365,
 136165,184045]