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A051882 as a simple table

na(n)
12
23
34
45
56
67
78
89
910
1012
1113
1214
1315
1416
1517
1618
1719
1820
1921
2022
2123
2225
2326
2427
2528
2629
2733
2834
2935
3036
3139
3240
3341
3442
3544
3646
3747
3848
3949
4051
4156
4258
4363
4468
4570
4672
4777

[2,3,4,5,6,7,8,9,10,12,13,14,15,16,17,18,19,20,21,
 22,23,25,26,27,28,29,33,34,35,36,39,40,41,42,44,
 46,47,48,49,51,56,58,63,68,70,72,77]