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A298388 as a simple table

na(n)
18
22048
313075
4135226
52837337
638706835
7509195874
88032883165
9118750882425
101707709022909
1125502618858251
12378609557364591
135566330211694048
1482417823620354907
151220987680054491593
1618041261703098651443

[8,2048,13075,135226,2837337,38706835,509195874,
 8032883165,118750882425,1707709022909,
 25502618858251,378609557364591,5566330211694048,
 82417823620354907,1220987680054491593,
 18041261703098651443]