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A028196 as a simple table

na(n)
01
135
2776
313930
4221151
53240825
644906926
7597218720
87698198101
996837355615
101194615734676
1114505367659510
12173840151316651
132060770407338405
1424205227062904026
15282088240414000300
163265447176464616801
1737582206965366853195
18430364865022642734976

[1,35,776,13930,221151,3240825,44906926,597218720,
 7698198101,96837355615,1194615734676,
 14505367659510,173840151316651,2060770407338405,
 24205227062904026,282088240414000300,
 3265447176464616801,37582206965366853195,
 430364865022642734976]