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A176561 as a simple table

na(n)
01
11
21
31
47
51
61
718
818
91
101
1138
1290
1338
141
151
1675
17360
18360
1975
201
211
22145
231309
242609
251309
26145
271
281
29280
304508
3116142
3216142
334508
34280
351
361
37544
3814970
3989464
40158022
4189464
4214970
43544
441
451
461065
4748414
48457794
491315770
501315770
51457794
5248414

[1,1,1,1,7,1,1,18,18,1,1,38,90,38,1,1,75,360,360,
 75,1,1,145,1309,2609,1309,145,1,1,280,4508,16142,
 16142,4508,280,1,1,544,14970,89464,158022,89464,
 14970,544,1,1,1065,48414,457794,1315770,1315770,
 457794,48414]