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A265758 as a simple table

na(n)
01
12
26
316
438
588
6200
7428
8902
91874
103780
117504
1214732
1328368
1454052
15101960
16189750
17349996
18640218
191159624
202084952
213722008
226593560
2311606268
2420308188
2535312170
2661065636
27105060200
28179795936
29306244136
30519291476
31876554860
321473504846

[1,2,6,16,38,88,200,428,902,1874,3780,7504,14732,
 28368,54052,101960,189750,349996,640218,1159624,
 2084952,3722008,6593560,11606268,20308188,
 35312170,61065636,105060200,179795936,306244136,
 519291476,876554860,1473504846]