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A338276 as a simple table

na(n)
12
22
34
46
56
66
78
810
912
1014
1112
1210
1310
1410
1516
1622
1722
1822
1920
2018
2118
2218
2316
2414
2516
2618
2720
2822
2922
3022
3132
3242
3344
3446
3536
3626
3726
3826
3932
4038
4136
4234
4328
4422
4522
4622
4724
4826
4926
5026
5128
5230
5330
5430
5532
5634
5740
5846
5944
6042
6142
6242
6364
6486
6586
6686
6768

[2,2,4,6,6,6,8,10,12,14,12,10,10,10,16,22,22,22,
 20,18,18,18,16,14,16,18,20,22,22,22,32,42,44,46,
 36,26,26,26,32,38,36,34,28,22,22,22,24,26,26,26,
 28,30,30,30,32,34,40,46,44,42,42,42,64,86,86,86,
 68]