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A293327 as a simple table

na(n)
00
11
22
34
49
518
636
773
8147
9295
10591
111182
122364
134729
149459
1518918
1637837
1775674
18151348
19302697
20605395
211210791
222421582
234843165
249686330
2519372660
2638745320
2777490641
28154981282
29309962565
30619925131
311239850262
322479700524
334959401049
349918802098

[0,1,2,4,9,18,36,73,147,295,591,1182,2364,4729,
 9459,18918,37837,75674,151348,302697,605395,
 1210791,2421582,4843165,9686330,19372660,38745320,
 77490641,154981282,309962565,619925131,1239850262,
 2479700524,4959401049,9918802098]