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A099721 as a simple table

na(n)
00
13
220
363
4144
5275
6468
7735
81088
91539
102100
112783
123600
134563
145684
156975
168448
1710115
1811988
1914079
2016400
2118963
2221780
2324863
2428224
2531875
2635828
2740095
2844688
2949619
3054900
3160543
3266560
3372963
3479764
3586975
3694608
37102675
38111188

[0,3,20,63,144,275,468,735,1088,1539,2100,2783,
 3600,4563,5684,6975,8448,10115,11988,14079,16400,
 18963,21780,24863,28224,31875,35828,40095,44688,
 49619,54900,60543,66560,72963,79764,86975,94608,
 102675,111188]