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A166798 as a simple table

na(n)
10
20
3105
4767
53160
69756
725163
857293
9118936
10229824
11419277
12729531
131219856
141971580
153094143
164732313
177074704
1810363744
1914907249
2021091767
2129397864
2240417532
2354873907
2473643493
2597781096
26128547680

[0,0,105,767,3160,9756,25163,57293,118936,229824,
 419277,729531,1219856,1971580,3094143,4732313,
 7074704,10363744,14907249,21091767,29397864,
 40417532,54873907,73643493,97781096,128547680]