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A263042 as a simple table

na(n)
00
12
24
36
48
510
612
714
816
918
103
115
127
139
1411
1513
1615
1717
1819
1921
206
218
2210
2312
2414
2516
2618
2720
2822
2924
309
3111
3213
3315
3417
3519
3621
3723
3825
3927
4012
4114
4216
4318
4420
4522
4624
4726
4828
4930
5015
5117
5219
5321
5423
5525
5627
5729
5831
5933
6018
6120
6222
6324
6426
6528
6630
6732
6834
6936

[0,2,4,6,8,10,12,14,16,18,3,5,7,9,11,13,15,17,19,
 21,6,8,10,12,14,16,18,20,22,24,9,11,13,15,17,19,
 21,23,25,27,12,14,16,18,20,22,24,26,28,30,15,17,
 19,21,23,25,27,29,31,33,18,20,22,24,26,28,30,32,
 34,36]