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A304711 as a simple table

na(n)
12
24
36
48
510
612
714
815
916
1018
1120
1222
1324
1426
1528
1630
1732
1833
1934
2035
2136
2238
2340
2444
2545
2646
2748
2850
2951
3052
3154
3255
3356
3458
3560
3662
3764
3866
3968
4069
4170
4272
4374
4475
4576
4677
4780
4882
4985
5086
5188
5290
5392
5493
5594
5695
5796
5898
5999
60100
61102
62104
63106
64108
65110

[2,4,6,8,10,12,14,15,16,18,20,22,24,26,28,30,32,
 33,34,35,36,38,40,44,45,46,48,50,51,52,54,55,56,
 58,60,62,64,66,68,69,70,72,74,75,76,77,80,82,85,
 86,88,90,92,93,94,95,96,98,99,100,102,104,106,108,
 110]