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A298769 as a simple table

na(n)
18
22048
311807
489295
5754713
66456802
753950338
8454801194
93847185453
1032497437189
11274558538901
122321648021996
1319629628158181
14165957305627364
151403226073953134
1611865080326336066
17100325233293376853

[8,2048,11807,89295,754713,6456802,53950338,
 454801194,3847185453,32497437189,274558538901,
 2321648021996,19629628158181,165957305627364,
 1403226073953134,11865080326336066,
 100325233293376853]