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A180811 as a simple table

na(n)
10
225
3666
411900
5163438
61652886
713449080
888130750
9492442470
102357340087
1110047650020
1238205314077
13133156227170
14425294714200
151270882760243
163544701971008
179383313284266
1823492592128799
1956409558569833

[0,25,666,11900,163438,1652886,13449080,88130750,
 492442470,2357340087,10047650020,38205314077,
 133156227170,425294714200,1270882760243,
 3544701971008,9383313284266,23492592128799,
 56409558569833]