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A208948 as a simple table

na(n)
120
2264
31464
45238
514430
633468
768722
8128844
9225126
10371858
11586668
12890880
131309872
141873416
152616036
163577366
174802490
186342300
198253854
2010600716
2113453314
2216889298
2320993880
2425860192
2531589644
2638292264
2746087056
2855102358

[20,264,1464,5238,14430,33468,68722,128844,225126,
 371858,586668,890880,1309872,1873416,2616036,
 3577366,4802490,6342300,8253854,10600716,13453314,
 16889298,20993880,25860192,31589644,38292264,
 46087056,55102358]