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A337945 as a simple table

na(n)
12
24
36
48
59
610
712
814
916
1018
1120
1222
1324
1425
1526
1627
1728
1830
1932
2034
2136
2238
2340
2442
2544
2645
2746
2848
2949
3050
3152
3254
3356
3458
3560
3662
3763
3864
3966
4068
4170
4272
4374
4475
4576
4678
4780
4881
4982
5084
5186
5288
5390
5492
5594
5696
5798
5899
59100
60102
61104
62106
63108
64110
65112
66114
67116
68117
69118
70120

[2,4,6,8,9,10,12,14,16,18,20,22,24,25,26,27,28,30,
 32,34,36,38,40,42,44,45,46,48,49,50,52,54,56,58,
 60,62,63,64,66,68,70,72,74,75,76,78,80,81,82,84,
 86,88,90,92,94,96,98,99,100,102,104,106,108,110,
 112,114,116,117,118,120]