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A024771 as a simple table

na(n)
01
128
2515
37850
4107481
51373088
616714975
7196403350
82246489861
925160397548
10277090599435
113010102678050
1232332333478641
13344033387428408
143631750686931895
1538080468894107950
16396993032851849821

[1,28,515,7850,107481,1373088,16714975,196403350,
 2246489861,25160397548,277090599435,3010102678050,
 32332333478641,344033387428408,3631750686931895,
 38080468894107950,396993032851849821]