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A247427 as a simple table

na(n)
12
24
36
48
510
612
714
815
917
1019
1121
1223
1325
1427
1529
1631
1733
1835
1937
2039
2140
2242
2344
2446
2548
2650
2752
2854
2955
3057
3159
3261
3363
3465
3567
3669
3771
3873
3975
4077
4179
4280
4382
4484
4586
4688
4790
4892
4994
5095
5197
5299
53101
54103
55104
56106
57108
58110
59112
60114
61116
62118
63119

[2,4,6,8,10,12,14,15,17,19,21,23,25,27,29,31,33,
 35,37,39,40,42,44,46,48,50,52,54,55,57,59,61,63,
 65,67,69,71,73,75,77,79,80,82,84,86,88,90,92,94,
 95,97,99,101,103,104,106,108,110,112,114,116,118,
 119]