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A186867 as a simple table

na(n)
10
20
32384
4183472
51110000
63193800
76481216
810899404
916418600
1023038804
1130760016
1239582236
1349505464
1460529700
1572654944
1685881196
17100208456
18115636724
19132166000
20149796284
21168527576
22188359876
23209293184
24231327500
25254462824
26278699156

[0,0,2384,183472,1110000,3193800,6481216,10899404,
 16418600,23038804,30760016,39582236,49505464,
 60529700,72654944,85881196,100208456,115636724,
 132166000,149796284,168527576,188359876,209293184,
 231327500,254462824,278699156]