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A061408 as a simple table

na(n)
04
16
28
310
412
512
614
716
816
918
1020
1120
1222
1324
1424
1524
1626
1728
1828
1930
2030
2132
2232
2334
2436
2536
2636
2738
2840
2940
3040
3142
3242
3344
3444
3546
3648
3748
3848
3948
4050
4152
4252
4354
4454
4556
4656
4756
4858
4960
5060
5160
5260
5362
5464
5564
5664
5766
5866
5968
6068
6170
6270
6372

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