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A305703 as a simple table

na(n)
12
24
36
48
510
614
720
822
926
1028
1134
1238
1346
1452
1558
1662
1774
1882
1986
2092
2194
22102
23106
24116
25118
26122
27124
28134
29138
30142
31146
32148
33158
34166
35178
36184
37188
38194
39202
40206
41212
42214
43218
44226
45244
46246
47254
48262
49274
50278
51282
52284
53298
54302
55314
56316

[2,4,6,8,10,14,20,22,26,28,34,38,46,52,58,62,74,
 82,86,92,94,102,106,116,118,122,124,134,138,142,
 146,148,158,166,178,184,188,194,202,206,212,214,
 218,226,244,246,254,262,274,278,282,284,298,302,
 314,316]