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A040307 as a simple table

na(n)
018
118
236
318
436
518
636
718
836
918
1036
1118
1236
1318
1436
1518
1636
1718
1836
1918
2036
2118
2236
2318
2436
2518
2636
2718
2836
2918
3036
3118
3236
3318
3436
3518
3636
3718
3836
3918
4036
4118
4236
4318
4436
4518
4636
4718
4836
4918
5036
5118
5236
5318
5436
5518
5636
5718
5836
5918
6036
6118
6236

[18,18,36,18,36,18,36,18,36,18,36,18,36,18,36,18,
 36,18,36,18,36,18,36,18,36,18,36,18,36,18,36,18,
 36,18,36,18,36,18,36,18,36,18,36,18,36,18,36,18,
 36,18,36,18,36,18,36,18,36,18,36,18,36,18,36]