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A089681 as a simple table

na(n)
11
22
34
46
58
612
714
818
922
1026
1128
1230
1334
1440
1544
1648
1750
1852
1954
2058
2160
2270
2372
2474
2576
2678
2792
2896
29110
30118
31122
32136
33138
34144
35150
36154
37158
38164
39176
40182
41186
42188
43204
44210
45214
46216
47230
48232
49234
50236
51242
52248
53260
54268
55272
56274
57280
58298
59304
60308

[1,2,4,6,8,12,14,18,22,26,28,30,34,40,44,48,50,52,
 54,58,60,70,72,74,76,78,92,96,110,118,122,136,138,
 144,150,154,158,164,176,182,186,188,204,210,214,
 216,230,232,234,236,242,248,260,268,272,274,280,
 298,304,308]