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A252296 as a simple table

na(n)
15
213
321
434
555
6144
7610
82584
96765
1010946
1146368
12196418
13832040
1414930352
15267914296
161134903170
174807526976
18365435296162
191548008755920
20117669030460994
21498454011879264
222111485077978050
23160500643816367088
2412200160415121876738
2551680708854858323072

[5,13,21,34,55,144,610,2584,6765,10946,46368,
 196418,832040,14930352,267914296,1134903170,
 4807526976,365435296162,1548008755920,
 117669030460994,498454011879264,2111485077978050,
 160500643816367088,12200160415121876738,
 51680708854858323072]