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A028208 as a simple table

na(n)
01
135
2777
313999
4223769
53314031
646600009
7631601663
88333511417
9107767060687
101372468494761
1117273924107167
12215413939302745
132666835630709103
1432824988535796233
15402159883923086911

[1,35,777,13999,223769,3314031,46600009,631601663,
 8333511417,107767060687,1372468494761,
 17273924107167,215413939302745,2666835630709103,
 32824988535796233,402159883923086911]