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A004271 as a simple table

na(n)
00
11
22
33
44
56
68
710
812
914
1016
1118
1220
1322
1424
1526
1628
1730
1832
1934
2036
2138
2240
2342
2444
2546
2648
2750
2852
2954
3056
3158
3260
3362
3464
3566
3668
3770
3872
3974
4076
4178
4280
4382
4484
4586
4688
4790
4892
4994
5096
5198
52100
53102
54104

[0,1,2,3,4,6,8,10,12,14,16,18,20,22,24,26,28,30,
 32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,
 64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,
 96,98,100,102,104]