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A211390 as a simple table

na(n)
12
24
34
46
56
68
78
811
910
1012
1112
1216
1314
1416
1516
1620
1718
1820
1920
2024
2122
2224
2324
2428
2526
2628
2728
2832
2930
3032
3132
3236
3334
3436
3536
3640
3738
3840
3940
4044
4142
4244
4344
4448
4546
4648
4748
4852
4950
5052
5152
5256
5354
5456
5556
5660
5758
5860
5960
6064
6162
6264
6364
6468
6566
6668
6768

[2,4,4,6,6,8,8,11,10,12,12,16,14,16,16,20,18,20,
 20,24,22,24,24,28,26,28,28,32,30,32,32,36,34,36,
 36,40,38,40,40,44,42,44,44,48,46,48,48,52,50,52,
 52,56,54,56,56,60,58,60,60,64,62,64,64,68,66,68,
 68]