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A281969 as a simple table

na(n)
01
12
25
311
423
543
674
7124
8197
9296
10434
11627
12875
131188
141600
152128
162755
173522
184511
195661
206983
218637
2210610
2312781
2415343
2518497
2621937
2725751
2830416
2935702
3041266
3147772
3255531
3363578
3472405
3583101
3694662
37106544
38120507
39136663
40152742
41170490
42191873

[1,2,5,11,23,43,74,124,197,296,434,627,875,1188,
 1600,2128,2755,3522,4511,5661,6983,8637,10610,
 12781,15343,18497,21937,25751,30416,35702,41266,
 47772,55531,63578,72405,83101,94662,106544,120507,
 136663,152742,170490,191873]