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A153947 as a simple table

na(n)
01
12
22
34
411
523
683
7542
82154
915035
10184615
111315991
1216739106
13377984235
145010747205
15118406407922
164950057264228
17123458500863829

[1,2,2,4,11,23,83,542,2154,15035,184615,1315991,
 16739106,377984235,5010747205,118406407922,
 4950057264228,123458500863829]