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A153938 as a simple table

na(n)
01
12
22
33
415
524
695
7901
82926
922625
10415047
112632895
1239794767
131442122393
1417977314936
15535815289761
1638169625321927
17935805308861487
1854839755115620718
197680772354691458379
20370282826884218784372

[1,2,2,3,15,24,95,901,2926,22625,415047,2632895,
 39794767,1442122393,17977314936,535815289761,
 38169625321927,935805308861487,54839755115620718,
 7680772354691458379,370282826884218784372]