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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 15 |
| 3 | 63 |
| 4 | 255 |
| 5 | 1017 |
| 6 | 4065 |
| 7 | 16257 |
| 8 | 65025 |
| 9 | 260091 |
| 10 | 1040319 |
| 11 | 4161087 |
| 12 | 16643583 |
| 13 | 66571281 |
| 14 | 266272929 |
| 15 | 1065042945 |
| 16 | 4259976705 |
| 17 | 17039126547 |
| 18 | 68153385231 |
| 19 | 272601057663 |
| 20 | 1090354299903 |
| 21 | 4361217485769 |
| 22 | 17444071124289 |
| 23 | 69773089368321 |
[3,15,63,255,1017,4065,16257,65025,260091,1040319, 4161087,16643583,66571281,266272929,1065042945, 4259976705,17039126547,68153385231,272601057663, 1090354299903,4361217485769,17444071124289, 69773089368321] |