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A006522 as a simple table

na(n)
01
10
20
31
44
511
625
750
891
9154
10246
11375
12550
13781
141079
151456
161925
172500
183196
194029
205016
216175
227525
239086
2410879
2512926
2615250
2717875
2820826
2924129
3027811
3131900
3236425
3341416
3446904
3552921
3659500
3766675
3874481
3982954
4092131

[1,0,0,1,4,11,25,50,91,154,246,375,550,781,1079,
 1456,1925,2500,3196,4029,5016,6175,7525,9086,
 10879,12926,15250,17875,20826,24129,27811,31900,
 36425,41416,46904,52921,59500,66675,74481,82954,
 92131]