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A280884 as a simple table

na(n)
61
721
856
91386
10252
1118942
1228512
13837837
14122122
1517600583
161445808
17140411908
18301302288
1910781435088
2079318464
21333208994139
226813685494
23597189699029
24582524800704
2589346032143830
263151550453480
271467268659100530
281095411461933880
2945383787697612455

[1,21,56,1386,252,18942,28512,837837,122122,
 17600583,1445808,140411908,301302288,10781435088,
 79318464,333208994139,6813685494,597189699029,
 582524800704,89346032143830,3151550453480,
 1467268659100530,1095411461933880,
 45383787697612455]