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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 7 |
| 2 | 13 |
| 3 | 26 |
| 4 | 51 |
| 5 | 101 |
| 6 | 202 |
| 7 | 403 |
| 8 | 805 |
| 9 | 1609 |
| 10 | 3217 |
| 11 | 6434 |
| 12 | 12868 |
| 13 | 25736 |
| 14 | 51472 |
| 15 | 102944 |
| 16 | 205888 |
| 17 | 411775 |
| 18 | 823550 |
| 19 | 1647100 |
| 20 | 3294199 |
| 21 | 6588398 |
| 22 | 13176795 |
| 23 | 26353590 |
| 24 | 52707179 |
| 25 | 105414358 |
| 26 | 210828715 |
| 27 | 421657429 |
| 28 | 843314857 |
| 29 | 1686629714 |
| 30 | 3373259427 |
| 31 | 6746518853 |
| 32 | 13493037705 |
[4,7,13,26,51,101,202,403,805,1609,3217,6434, 12868,25736,51472,102944,205888,411775,823550, 1647100,3294199,6588398,13176795,26353590, 52707179,105414358,210828715,421657429,843314857, 1686629714,3373259427,6746518853,13493037705] |