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A123718 as a simple table

na(n)
00
11
22
33
44
56
65
78
87
99
1014
1110
1219
1316
1411
1515
1612
1721
1822
1913
2020
2117
2218
2323
2437
2524
2651
2742
2825
2938
3026
3156
3260
3327
3453
3544
3647
3728
3839
3929
4052
4143
4230
4340
4431
4558
4659
4732
4862
4963
5064
5133
5241
5334
5457
5561
5635
5754
5845
5946
6036
6155
6248
6349
6450
6565
66107
6766
68149
69121
7067

[0,1,2,3,4,6,5,8,7,9,14,10,19,16,11,15,12,21,22,
 13,20,17,18,23,37,24,51,42,25,38,26,56,60,27,53,
 44,47,28,39,29,52,43,30,40,31,58,59,32,62,63,64,
 33,41,34,57,61,35,54,45,46,36,55,48,49,50,65,107,
 66,149,121,67]