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A278930 as a simple table

na(n)
12
236
3100
42081
58257
632897
7131329
8524801
92098177
108390657
1133558529
12134225921
13536887297
142147516417
158590000129
1634359869441
17137439215617
18549756338177
192199024304129
208796095119361
2135184376283137
22140737496743937
23562949970198529
242251799847239681

[2,36,100,2081,8257,32897,131329,524801,2098177,
 8390657,33558529,134225921,536887297,2147516417,
 8590000129,34359869441,137439215617,549756338177,
 2199024304129,8796095119361,35184376283137,
 140737496743937,562949970198529,2251799847239681]