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A366971 as a simple table

na(n)
10
20
31
45
515
636
771
8131
9216
10346
11511
12756
131042
141441
151907
162527
173207
184128
195097
206371
217737
229442
2311213
2413538
2515848
2618734
2721744
2825423
2929077
3033743
3138238
3243818
3349440
3456104
3562694
3670979
3778749
3888154
3997580
40108790
41119450
42132680
43145021
44159974

[0,0,1,5,15,36,71,131,216,346,511,756,1042,1441,
 1907,2527,3207,4128,5097,6371,7737,9442,11213,
 13538,15848,18734,21744,25423,29077,33743,38238,
 43818,49440,56104,62694,70979,78749,88154,97580,
 108790,119450,132680,145021,159974]