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A250555 as a simple table

na(n)
15
225
383
4297
5989
63113
79611
829257
988503
10266769
11802699
122412545
137246311
1421755889
1565301163
16195969945
17588042095
181764390025
195293696363
2015882140601
2147648522543
22142949767457
23428857697715
241286589881041
253859803210479

[5,25,83,297,989,3113,9611,29257,88503,266769,
 802699,2412545,7246311,21755889,65301163,
 195969945,588042095,1764390025,5293696363,
 15882140601,47648522543,142949767457,428857697715,
 1286589881041,3859803210479]