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A084280 as a simple table

na(n)
11
22
38
464
51023
632596
72062592
8257798069
963135260853
1029939766625614
1127055039857514327

[1,2,8,64,1023,32596,2062592,257798069,
 63135260853,29939766625614,27055039857514327]