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A144860 as a simple table

na(n)
01
11
21
31
47
57
61
787
829
987
101
112047
122047
132047
142047
151
1615731
1778655
1815731
1915731
2078655
211
224439935
23887987
244439935
25887987
264439935
274439935
281
2949239241
3049239241
31344674687
3249239241
3349239241
3449239241
35344674687
361
3735162451967

[1,1,1,1,7,7,1,87,29,87,1,2047,2047,2047,2047,1,
 15731,78655,15731,15731,78655,1,4439935,887987,
 4439935,887987,4439935,4439935,1,49239241,
 49239241,344674687,49239241,49239241,49239241,
 344674687,1,35162451967]