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| n | a(n) |
|---|---|
| 1 | 24 |
| 2 | 56 |
| 3 | 128 |
| 4 | 254 |
| 5 | 516 |
| 6 | 982 |
| 7 | 1904 |
| 8 | 3578 |
| 9 | 6812 |
| 10 | 12786 |
| 11 | 24224 |
| 12 | 45658 |
| 13 | 86660 |
| 14 | 164422 |
| 15 | 313660 |
| 16 | 599546 |
| 17 | 1150980 |
| 18 | 2216138 |
| 19 | 4281996 |
| 20 | 8299742 |
| 21 | 16133004 |
| 22 | 31452126 |
| 23 | 61458520 |
| 24 | 120403946 |
| 25 | 236321944 |
| 26 | 464854866 |
| 27 | 915752544 |
| 28 | 1807260018 |
| 29 | 3570943416 |
[24,56,128,254,516,982,1904,3578,6812,12786,24224, 45658,86660,164422,313660,599546,1150980,2216138, 4281996,8299742,16133004,31452126,61458520, 120403946,236321944,464854866,915752544, 1807260018,3570943416] |