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A018901 as a simple table

na(n)
01
11
26
327
4146
5780
64332
724017
8135954
9767394
104395456
1125090131
12144840476
13833196442
144836766584
1527981391815
16163112472594
17947712321234
185542414273884
1932312202610863
20189456975899496
211107575676600876

[1,1,6,27,146,780,4332,24017,135954,767394,
 4395456,25090131,144840476,833196442,4836766584,
 27981391815,163112472594,947712321234,
 5542414273884,32312202610863,189456975899496,
 1107575676600876]