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A162539 as a simple table

na(n)
01
16
221
355
4120
5231
6405
7660
81014
91484
102085
112829
123724
134773
145973
157315
168784
1710359
1812013
1913713
2015420
2117091
2218681
2320145
2421440
2522527
2623373
2723952
2824246
2924246
3023952
3123373
3222527
3321440
3420145
3518681
3617091
3715420
3813713

[1,6,21,55,120,231,405,660,1014,1484,2085,2829,
 3724,4773,5973,7315,8784,10359,12013,13713,15420,
 17091,18681,20145,21440,22527,23373,23952,24246,
 24246,23952,23373,22527,21440,20145,18681,17091,
 15420,13713]