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A025969 as a simple table

na(n)
01
123
2353
34603
455449
5640851
67242961
780866811
8896831177
99909444259
10109271790849
111203605509899
1213249389022585
13145801783940147
141604171188346417
1517647994609290267
16194140618516940073

[1,23,353,4603,55449,640851,7242961,80866811,
 896831177,9909444259,109271790849,1203605509899,
 13249389022585,145801783940147,1604171188346417,
 17647994609290267,194140618516940073]