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A045621 as a simple table

na(n)
00
11
22
35
410
522
644
793
8186
9386
10772
111586
123172
136476
1412952
1526333
1652666
17106762
18213524
19431910
20863820
211744436
223488872
237036530
2414073060
2528354132
2656708264
27114159428
28228318856
29459312152
30918624304
311846943453
323693886906

[0,1,2,5,10,22,44,93,186,386,772,1586,3172,6476,
 12952,26333,52666,106762,213524,431910,863820,
 1744436,3488872,7036530,14073060,28354132,
 56708264,114159428,228318856,459312152,918624304,
 1846943453,3693886906]