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A131875 as a simple table

na(n)
01
15
24
312
45
57
622
76
88
910
1035
117
129
1311
1413
1551
168
1710
1812
1914
2016
2170
229
2311
2413
2515
2617
2719
2892
2910
3012
3114
3216
3318
3420
3522
36117
3711
3813
3915
4017
4119
4221
4323
4425
45145
4612
4714
4816
4918
5020
5122
5224
5326
5428

[1,5,4,12,5,7,22,6,8,10,35,7,9,11,13,51,8,10,12,
 14,16,70,9,11,13,15,17,19,92,10,12,14,16,18,20,22,
 117,11,13,15,17,19,21,23,25,145,12,14,16,18,20,22,
 24,26,28]