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A281817 as a simple table

na(n)
00
11
21
34
419
5116
6871
77764
880179
9941812
1012403711
11181056404
122901669739
1350656307508
14956922611191
1519449063226324
16423206168046499
179816562636678004
18241805428075379311
196303793707327637524
20173401707643671303259

[0,1,1,4,19,116,871,7764,80179,941812,12403711,
 181056404,2901669739,50656307508,956922611191,
 19449063226324,423206168046499,9816562636678004,
 241805428075379311,6303793707327637524,
 173401707643671303259]