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A171397 as a simple table

na(n)
00
11
22
33
44
55
66
77
88
99
1011
1112
1213
1314
1415
1516
1617
1718
1819
1920
2022
2123
2224
2325
2426
2527
2628
2729
2830
2931
3033
3134
3235
3336
3437
3538
3639
3740
3841
3942
4044
4145
4246
4347
4448
4549
4650
4751
4852
4953
5055
5156
5257
5358
5459
5560
5661
5762
5863
5964
6066
6167
6268
6369
6470
6571
6672

[0,1,2,3,4,5,6,7,8,9,11,12,13,14,15,16,17,18,19,
 20,22,23,24,25,26,27,28,29,30,31,33,34,35,36,37,
 38,39,40,41,42,44,45,46,47,48,49,50,51,52,53,55,
 56,57,58,59,60,61,62,63,64,66,67,68,69,70,71,72]