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A247423 as a simple table

na(n)
12
24
36
48
59
610
712
814
916
1018
1120
1222
1324
1425
1526
1628
1730
1832
1934
2035
2136
2238
2340
2442
2544
2646
2748
2850
2951
3052
3154
3256
3358
3460
3561
3662
3764
3866
3967
4068
4170
4272
4374
4476
4577
4678
4780
4882
4984
5086
5188
5290
5392
5493
5594
5696
5798
58100
59102
60103
61104
62106
63108
64110

[2,4,6,8,9,10,12,14,16,18,20,22,24,25,26,28,30,32,
 34,35,36,38,40,42,44,46,48,50,51,52,54,56,58,60,
 61,62,64,66,67,68,70,72,74,76,77,78,80,82,84,86,
 88,90,92,93,94,96,98,100,102,103,104,106,108,110]