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A168232 as a simple table

na(n)
12
20
34
42
56
64
78
86
910
108
1112
1210
1314
1412
1516
1614
1718
1816
1920
2018
2122
2220
2324
2422
2526
2624
2728
2826
2930
3028
3132
3230
3334
3432
3536
3634
3738
3836
3940
4038
4142
4240
4344
4442
4546
4644
4748
4846
4950
5048
5152
5250
5354
5452
5556
5654
5758
5856
5960
6058
6162
6260
6364
6462
6566
6664
6768
6866
6970
7068
7172

[2,0,4,2,6,4,8,6,10,8,12,10,14,12,16,14,18,16,20,
 18,22,20,24,22,26,24,28,26,30,28,32,30,34,32,36,
 34,38,36,40,38,42,40,44,42,46,44,48,46,50,48,52,
 50,54,52,56,54,58,56,60,58,62,60,64,62,66,64,68,
 66,70,68,72]