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A020891 as a simple table

na(n)
14
26
38
410
510
612
714
814
916
1018
1118
1220
1322
1422
1524
1626
1726
1828
1928
2030
2130
2232
2334
2434
2536
2636
2738
2838
2940
3042
3142
3242
3344
3444
3546
3646
3748
3848
3950
4050
4152
4252
4354
4454
4556
4658
4758
4860
4960
5060
5162
5262
5364
5466
5566
5666
5766
5868
5968
6070
6170
6272
6374
6474
6576
6676
6778
6878
6978
7078
7180
7282
7382

[4,6,8,10,10,12,14,14,16,18,18,20,22,22,24,26,26,
 28,28,30,30,32,34,34,36,36,38,38,40,42,42,42,44,
 44,46,46,48,48,50,50,52,52,54,54,56,58,58,60,60,
 60,62,62,64,66,66,66,66,68,68,70,70,72,74,74,76,
 76,78,78,78,78,80,82,82]