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A255519 as a simple table

na(n)
00
11
27
370
4868
511746
6169022
72533895
839156244
9619261762
109974917309
11163078496420
122699109217420
1345136794135853
14761492594770649
1512944937176754422
16221518183089901621
173812823547509811611
1865966582592220602621
191146568019260356348978

[0,1,7,70,868,11746,169022,2533895,39156244,
 619261762,9974917309,163078496420,2699109217420,
 45136794135853,761492594770649,12944937176754422,
 221518183089901621,3812823547509811611,
 65966582592220602621,1146568019260356348978]