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A155996 as a simple table

na(n)
01
12
23
36
413
525
650
7101
8201
9402
10804
111608
123217
136434
1412868
1525736
1651472
17102944
18205887
19411775
20823550
211647099
223294199
236588397
2413176795
2526353589
2652707179
27105414357
28210828714
29421657428
30843314857
311686629713
323373259426
336746518852

[1,2,3,6,13,25,50,101,201,402,804,1608,3217,6434,
 12868,25736,51472,102944,205887,411775,823550,
 1647099,3294199,6588397,13176795,26353589,
 52707179,105414357,210828714,421657428,843314857,
 1686629713,3373259426,6746518852]