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A257251 as a simple table

na(n)
12
22
36
42
56
620
72
86
910
1042
112
126
1320
1428
15110
162
176
1810
1914
2022
21156
222
236
2420
2528
2644
2752
28272
292
306
3110
3214
3322
3426
3534
36342
372
386
3920
4028
4144
4252
4368
4476
45506
462
476
4810
4942
5066
5178
52102
53114
54138
55812
562
576
5820
5914
6022
6126
6234
6338
6446
6558
66930
672
686
6910
7042
7166
7278
73102
74114
75138
76174
77186
781332

[2,2,6,2,6,20,2,6,10,42,2,6,20,28,110,2,6,10,14,
 22,156,2,6,20,28,44,52,272,2,6,10,14,22,26,34,342,
 2,6,20,28,44,52,68,76,506,2,6,10,42,66,78,102,114,
 138,812,2,6,20,14,22,26,34,38,46,58,930,2,6,10,42,
 66,78,102,114,138,174,186,1332]