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A054539 as a simple table

na(n)
31
41
52
63
75
88
915
1026
1147
1286
13158
14293
15548
161024
171928
183643
196899
2013108
2124970
2247663
2391181
24174768
25335546
26645278
271242767
282396746
294628198
308947868
3117318417
3233554432
3365075294
34126322568
35245426708

[1,1,2,3,5,8,15,26,47,86,158,293,548,1024,1928,
 3643,6899,13108,24970,47663,91181,174768,335546,
 645278,1242767,2396746,4628198,8947868,17318417,
 33554432,65075294,126322568,245426708]