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A166516 as a simple table

na(n)
01
11
22
34
410
525
665
7169
8442
91156
103026
117921
1220737
1354289
14142130
15372100
16974170
172550409
186677057
1917480761
2045765226
21119814916
22313679522
23821223649
242149991425
255628750625
2614736260450
2738580030724
28101003831722

[1,1,2,4,10,25,65,169,442,1156,3026,7921,20737,
 54289,142130,372100,974170,2550409,6677057,
 17480761,45765226,119814916,313679522,821223649,
 2149991425,5628750625,14736260450,38580030724,
 101003831722]