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A050190 as a simple table

na(n)
50
66
721
856
9126
10250
11462
12792
131287
142002
153000
164368
176188
188568
1911628
2015500
2120349
2226334
2333649
2442504
2553125
2665780
2780730
2898280
29118755
30142500
31169911
32201376
33237336
34278256
35324625
36376992
37435897
38501942

[0,6,21,56,126,250,462,792,1287,2002,3000,4368,
 6188,8568,11628,15500,20349,26334,33649,42504,
 53125,65780,80730,98280,118755,142500,169911,
 201376,237336,278256,324625,376992,435897,501942]