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A026251 as a simple table

na(n)
12
24
32
46
58
64
710
812
914
106
1116
1218
138
1420
1522
1624
1710
1826
1928
2012
2130
2232
2314
2434
2536
2638
2716
2840
2942
3018
3144
3246
3348
3420
3550
3652
3722
3854
3956
4024
4158
4260
4362
4426
4564
4666
4728
4868
4970
5072
5130
5274
5376
5432
5578
5680
5782
5834
5984
6086
6136
6288
6390

[2,4,2,6,8,4,10,12,14,6,16,18,8,20,22,24,10,26,28,
 12,30,32,14,34,36,38,16,40,42,18,44,46,48,20,50,
 52,22,54,56,24,58,60,62,26,64,66,28,68,70,72,30,
 74,76,32,78,80,82,34,84,86,36,88,90]