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A129298 as a simple table

na(n)
10
251
3120
4267
5540
6931
71780
83367
95644
1010591
1119840
1233111
1361944
14115851
15193200
16361251
17675444
181126267
192105740
203936991
216564580
2212273367
2322946680
2438261391
2571534640
26133743267
27223003944
28416934651
29779513100
301299762451

[0,51,120,267,540,931,1780,3367,5644,10591,19840,
 33111,61944,115851,193200,361251,675444,1126267,
 2105740,3936991,6564580,12273367,22946680,
 38261391,71534640,133743267,223003944,416934651,
 779513100,1299762451]