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A338254 as a simple table

na(n)
00
11
22
34
43
55
66
79
810
98
107
1117
1218
1316
1415
1512
1611
1713
1814
1920
2019
2121
2222
2325
2426
2524
2623
2736
2835
2937
3038
3141
3242
3340
3439
3533
3634
3732
3831
3928
4027
4129
4230
4368
4467
4569
4670
4773
4874
4972
5071
5165
5266
5364
5463
5560
5659
5761
5862
5949
6050
6148
6247
6344
6443
6545
6646
6752

[0,1,2,4,3,5,6,9,10,8,7,17,18,16,15,12,11,13,14,
 20,19,21,22,25,26,24,23,36,35,37,38,41,42,40,39,
 33,34,32,31,28,27,29,30,68,67,69,70,73,74,72,71,
 65,66,64,63,60,59,61,62,49,50,48,47,44,43,45,46,
 52]