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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 10 |
| 2 | 25 |
| 3 | 58 |
| 4 | 127 |
| 5 | 268 |
| 6 | 553 |
| 7 | 1126 |
| 8 | 2275 |
| 9 | 4576 |
| 10 | 9181 |
| 11 | 18394 |
| 12 | 36823 |
| 13 | 73684 |
| 14 | 147409 |
| 15 | 294862 |
| 16 | 589771 |
| 17 | 1179592 |
| 18 | 2359237 |
| 19 | 4718530 |
| 20 | 9437119 |
| 21 | 18874300 |
| 22 | 37748665 |
| 23 | 75497398 |
| 24 | 150994867 |
| 25 | 301989808 |
| 26 | 603979693 |
| 27 | 1207959466 |
| 28 | 2415919015 |
| 29 | 4831838116 |
| 30 | 9663676321 |
| 31 | 19327352734 |
[4,10,25,58,127,268,553,1126,2275,4576,9181,18394, 36823,73684,147409,294862,589771,1179592,2359237, 4718530,9437119,18874300,37748665,75497398, 150994867,301989808,603979693,1207959466, 2415919015,4831838116,9663676321,19327352734] |