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A257219 as a simple table

na(n)
12
24
36
48
510
612
714
816
918
1020
1121
1222
1323
1424
1525
1626
1727
1828
1929
2030
2132
2234
2336
2438
2540
2642
2744
2846
2948
3050
3152
3254
3356
3458
3560
3662
3763
3864
3966
4068
4169
4270
4372
4474
4575
4676
4778
4880
4981
5082
5184
5286
5387
5488
5590
5692
5794
5896
5998
60100
61102
62104
63105
64106
65108

[2,4,6,8,10,12,14,16,18,20,21,22,23,24,25,26,27,
 28,29,30,32,34,36,38,40,42,44,46,48,50,52,54,56,
 58,60,62,63,64,66,68,69,70,72,74,75,76,78,80,81,
 82,84,86,87,88,90,92,94,96,98,100,102,104,105,106,
 108]