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A084638 as a simple table

na(n)
01
11
22
34
48
516
632
764
8129
9265
10558
111200
122610
135682
1412288
1526292
1655587
17116179
18240366
19493108
201004780
212036692
224112144
238278552
2416631717
2533364381
2666863358
27133903816
28268037862
29536371734
301073120208
312146715436
324294024647
338588785575

[1,1,2,4,8,16,32,64,129,265,558,1200,2610,5682,
 12288,26292,55587,116179,240366,493108,1004780,
 2036692,4112144,8278552,16631717,33364381,
 66863358,133903816,268037862,536371734,1073120208,
 2146715436,4294024647,8588785575]