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A257681 as a simple table

na(n)
00
11
22
33
41
54
65
76
87
98
109
1110
122
1311
1412
1513
163
1714
181
1915
2016
2117
224
2318
2419
2520
2621
2722
2823
2924
3025
3126
3227
3328
3429
3530
3631
3732
3833
3934
4035
4136
4237
4338
4439
4540
4641
4742
485
4943
5044
5145
526
5346
5447
5548
5649
5750
5851
5952
607
6153
6254
6355
648
6556
669
6757
6858
6959
7010
7160
722

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