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A055966 as a simple table

na(n)
00
12
24
36
48
510
612
714
816
918
1020
1122
1224
1326
1428
1530
1632
1734
1836
1938
2021
2142
2263
2384
24105
25126
26147
27168
28189
29210
30231
31252
32273
33294
34315
35336
36357
37378
38399
39420
4042
4163
4284
43105
44126
45147
46168
47189
48210
49231
50252
51273
52294
53315
54336
55357
56378
57399
58420

[0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,
 36,38,21,42,63,84,105,126,147,168,189,210,231,252,
 273,294,315,336,357,378,399,420,42,63,84,105,126,
 147,168,189,210,231,252,273,294,315,336,357,378,
 399,420]