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A173069 as a simple table

na(n)
0-1
1-2
2-2
3-2
4-2
5-2
60
70
8-2
9-2
100
110
120
134
1412
158
16-2
17-2
180
190
200
214
2212
238
240
254
2612
2712
2816
2936
3056
3132
32-2
33-2
340
350
360
374
3812
398
400
414
4212
4312
4416
4536
4656
4732
480
494
5012
5112
5216
5336
5456
5536
5616
5736
5860
5964
6092
61160
62192
6396
64-2
65-2
660
670
680
694
7012
718
720
734
7412

[-1,-2,-2,-2,-2,-2,0,0,-2,-2,0,0,0,4,12,8,-2,-2,0,
 0,0,4,12,8,0,4,12,12,16,36,56,32,-2,-2,0,0,0,4,12,
 8,0,4,12,12,16,36,56,32,0,4,12,12,16,36,56,36,16,
 36,60,64,92,160,192,96,-2,-2,0,0,0,4,12,8,0,4,12]