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A007605 as a simple table

na(n)
12
23
35
47
52
64
78
810
95
1011
114
1210
135
147
1511
168
1714
187
1913
208
2110
2216
2311
2417
2516
262
274
288
2910
305
3110
325
3311
3413
3514
367
3713
3810
3914
4011
4117
4210
4311
4413
4517
4619
474
487
4911
5013
518
5214
537
548
5514
5611
5717
5810
5916
6011
6113
6214
6310
645
657
6611
677
6813
6914
7016
7111
7217
7316
7413
7519
7614
7720
7819
795

[2,3,5,7,2,4,8,10,5,11,4,10,5,7,11,8,14,7,13,8,10,
 16,11,17,16,2,4,8,10,5,10,5,11,13,14,7,13,10,14,
 11,17,10,11,13,17,19,4,7,11,13,8,14,7,8,14,11,17,
 10,16,11,13,14,10,5,7,11,7,13,14,16,11,17,16,13,
 19,14,20,19,5]