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A297991 as a simple table

na(n)
15
2573
31274
44648
518189
674675
7290466
81134198
94475863
1017501388
1168447326
12268885391
131056650444
144151346258
1516317217303
1664161745436
17252378618258
18993086741498
193908970841059
2015390703083981
2160613211125295

[5,573,1274,4648,18189,74675,290466,1134198,
 4475863,17501388,68447326,268885391,1056650444,
 4151346258,16317217303,64161745436,252378618258,
 993086741498,3908970841059,15390703083981,
 60613211125295]