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A177888 as a simple table

na(n)
01
12
21
33
43
51
64
75
87
91
105
117
1217
1343
141
156
169
1731
18257
191807
201
217
2211
2349
24871
2565537
263263443
271
288
2913
3071
312209
32756031
334294967297
3410650056950807
351
369
3715
3897
394691
404870849
41571580604871
4218446744073709551617
43113423713055421844361000443
441

[1,2,1,3,3,1,4,5,7,1,5,7,17,43,1,6,9,31,257,1807,
 1,7,11,49,871,65537,3263443,1,8,13,71,2209,756031,
 4294967297,10650056950807,1,9,15,97,4691,4870849,
 571580604871,18446744073709551617,
 113423713055421844361000443,1]