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A172351 as a simple table

na(n)
01
11
21
31
41
51
61
77
87
91
101
1113
1291
1313
141
151
1655
17715
18715
1955
201
211
22133
237315
2413585
257315
26133
271
281
29463
3061579
31483835
32483835
3361579
34463
351
361
371261
38583843
3911093017
4046931995
4111093017
42583843
431261
441
451
464039
475093179
48336877411

[1,1,1,1,1,1,1,7,7,1,1,13,91,13,1,1,55,715,715,55,
 1,1,133,7315,13585,7315,133,1,1,463,61579,483835,
 483835,61579,463,1,1,1261,583843,11093017,
 46931995,11093017,583843,1261,1,1,4039,5093179,
 336877411]