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A189549 as a simple table

na(n)
10
2552
35416
426804
597836
6274132
7683144
81481908
92937048
105414876
119605792
1215831096
1325469448
1439609448
1559492044
1686819652
17124912364
18174698948
19241615316
20327281004
21436632904
22575430892
23752423588
24965700832
251230962864

[0,552,5416,26804,97836,274132,683144,1481908,
 2937048,5414876,9605792,15831096,25469448,
 39609448,59492044,86819652,124912364,174698948,
 241615316,327281004,436632904,575430892,752423588,
 965700832,1230962864]