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A018841 as a simple table

na(n)
00
12
24
36
44
52
64
76
86
96
104
116
126
136
148
156
168
178
188
1910
208
2110
2210
2310
2412
2510
2612
2712
2812
2914
3012
3114
3214
3314
3416
3514
3616
3716
3816
3918
4016
4118
4218
4318
4420
4518
4620
4720
4820
4922
5020
5122
5222
5322
5424
5522
5624
5724
5824
5926
6024
6126
6226
6326
6428
6526
6628
6728
6828
6930
7028
7130
7230
7330
7432
7530
7632
7732

[0,2,4,6,4,2,4,6,6,6,4,6,6,6,8,6,8,8,8,10,8,10,10,
 10,12,10,12,12,12,14,12,14,14,14,16,14,16,16,16,
 18,16,18,18,18,20,18,20,20,20,22,20,22,22,22,24,
 22,24,24,24,26,24,26,26,26,28,26,28,28,28,30,28,
 30,30,30,32,30,32,32]