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A251546 as a simple table

na(n)
12
24
34
46
56
66
76
86
96
1010
1110
1210
1310
1410
1510
1618
1718
1818
1918
2018
2118
2218
2318
2418
2518
2618
2718
2818
2918
3018
3124
3224
3330
3430
3530
3630
3730
3830
3938
4038
4140
4240
4340
4440
4540
4640
4740
4846
4946
5046
5146
5246
5346
5446
5546
5654
5754
5854

[2,4,4,6,6,6,6,6,6,10,10,10,10,10,10,18,18,18,18,
 18,18,18,18,18,18,18,18,18,18,18,24,24,30,30,30,
 30,30,30,38,38,40,40,40,40,40,40,40,46,46,46,46,
 46,46,46,46,54,54,54]