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A297121 as a simple table

na(n)
12
24
31
46
57
68
720
810
912
1014
1116
1218
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
5321
5419
5523
5625
5737
5839
5941
6043
6145
6257
6359
6461
6563
6665
6777
6879
6981
7083
7185
7299
73104
74106
75112

[2,4,1,6,7,8,20,10,12,14,16,18,22,24,26,28,30,32,
 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,
 98,100,21,19,23,25,37,39,41,43,45,57,59,61,63,65,
 77,79,81,83,85,99,104,106,112]