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A138415 as a simple table

na(n)
00
11
22
34
410
531
6110
7421
81686
96961
1029392
11126292
12550360
132426503
1410803802
1548507844
16219377950
17998436793
184569488372
1921016589074
2097090411020
21450314942683
222096122733212
239788916220519
2445850711498860
25215348942668681
261013979873542690
274785437476592806

[0,1,2,4,10,31,110,421,1686,6961,29392,126292,
 550360,2426503,10803802,48507844,219377950,
 998436793,4569488372,21016589074,97090411020,
 450314942683,2096122733212,9788916220519,
 45850711498860,215348942668681,1013979873542690,
 4785437476592806]