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A154816 as a simple table

na(n)
02
15
25
317
466
517
665
7685
8685
965
10257
116572
1216342
136572
14257
151025
1660675
17313300
18313300
1960675
201025
214097
22549418
235340455
2410712060
255340455
26549418
274097
2816385
294931825
3084856215
31303945575
32303945575
3384856215
344931825
3516385

[2,5,5,17,66,17,65,685,685,65,257,6572,16342,6572,
 257,1025,60675,313300,313300,60675,1025,4097,
 549418,5340455,10712060,5340455,549418,4097,16385,
 4931825,84856215,303945575,303945575,84856215,
 4931825,16385]