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A100921 as a simple table

na(n)
00
12
24
34
45
56
68
78
88
99
109
1110
1210
1311
1412
1512
1613
1714
1816
1916
2016
2116
2217
2317
2417
2518
2618
2718
2819
2919
3020
3120
3220
3321
3421
3522
3622
3723
3824
3924
4024
4125
4225
4326
4426
4527
4628
4728
4829
4930
5032
5132
5232
5332
5432
5533
5633
5733
5833
5934
6034
6134
6234
6335
6435
6535
6636
6736
6836
6936
7037
7137
7237

[0,2,4,4,5,6,8,8,8,9,9,10,10,11,12,12,13,14,16,16,
 16,16,17,17,17,18,18,18,19,19,20,20,20,21,21,22,
 22,23,24,24,24,25,25,26,26,27,28,28,29,30,32,32,
 32,32,32,33,33,33,33,34,34,34,34,35,35,35,36,36,
 36,36,37,37,37]