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A343993 as a simple table

na(n)
15
237
3353
41761
58917
626773
784497
8215545
9508613
101044825
112184125
124036481
137550669
1413068897
1521666789
1634540637
1755656469
1884953609
19130542493
20192747673
21278927225
22393687369
23559130085
24770515489
251059144047

[5,37,353,1761,8917,26773,84497,215545,508613,
 1044825,2184125,4036481,7550669,13068897,21666789,
 34540637,55656469,84953609,130542493,192747673,
 278927225,393687369,559130085,770515489,
 1059144047]