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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 15 |
| 3 | 26 |
| 4 | 81 |
| 5 | 130 |
| 6 | 350 |
| 7 | 558 |
| 8 | 1417 |
| 9 | 2282 |
| 10 | 5632 |
| 11 | 9190 |
| 12 | 22296 |
| 13 | 36834 |
| 14 | 88280 |
| 15 | 147422 |
| 16 | 349929 |
| 17 | 589786 |
| 18 | 1388672 |
| 19 | 2359254 |
| 20 | 5516356 |
| 21 | 9437138 |
| 22 | 21931190 |
| 23 | 37748686 |
| 24 | 87250096 |
| 25 | 150994890 |
| 26 | 347306730 |
| 27 | 603979718 |
| 28 | 1383135310 |
| 29 | 2415919042 |
[1,3,15,26,81,130,350,558,1417,2282,5632,9190, 22296,36834,88280,147422,349929,589786,1388672, 2359254,5516356,9437138,21931190,37748686, 87250096,150994890,347306730,603979718,1383135310, 2415919042] |