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A056757 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1012
1114
1215
1316
1418
1520
1621
1722
1824
1925
2026
2127
2228
2330
2432
2533
2634
2735
2836
2938
3039
3140
3242
3344
3445
3546
3648
3750
3851
3952
4054
4155
4256
4357
4458
4560
4662
4763
4864
4966
5068
5170
5272
5375
5476
5578
5680
5781
5884
5988
6090
6192
6296
6398
6499
65100
66102
67104
68105
69108
70110

[2,3,4,5,6,7,8,9,10,12,14,15,16,18,20,21,22,24,25,
 26,27,28,30,32,33,34,35,36,38,39,40,42,44,45,46,
 48,50,51,52,54,55,56,57,58,60,62,63,64,66,68,70,
 72,75,76,78,80,81,84,88,90,92,96,98,99,100,102,
 104,105,108,110]