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A260320 as a simple table

na(n)
10
20
30
40
51
60
74
811
942
1089
11329
121765
139197
1445647
15284743
161846189
1711975869
1883259065
19621001708
204878630533
2139333230881
22336375931369
233029241762900
2428439270037332
25275986675209470
262789712437580722

[0,0,0,0,1,0,4,11,42,89,329,1765,9197,45647,
 284743,1846189,11975869,83259065,621001708,
 4878630533,39333230881,336375931369,3029241762900,
 28439270037332,275986675209470,2789712437580722]