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A228736 as a simple table

na(n)
15
225
3125
4545
51943
66797
723627
883391
9298239
101073743
113873051
1213959617
1350261845
14180829983
15650385801
162339156205
178413500735
1830263904639
19108865370619
20391615337877
211408733302733
225067520822187
2318228904185829

[5,25,125,545,1943,6797,23627,83391,298239,
 1073743,3873051,13959617,50261845,180829983,
 650385801,2339156205,8413500735,30263904639,
 108865370619,391615337877,1408733302733,
 5067520822187,18228904185829]