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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 28 |
| 4 | 72 |
| 5 | 172 |
| 6 | 397 |
| 7 | 867 |
| 8 | 1840 |
| 9 | 3783 |
| 10 | 7580 |
| 11 | 14829 |
| 12 | 28454 |
| 13 | 53540 |
| 14 | 99119 |
| 15 | 180676 |
| 16 | 324758 |
| 17 | 576145 |
| 18 | 1010051 |
| 19 | 1750782 |
| 20 | 3003386 |
| 21 | 5101769 |
| 22 | 8586891 |
| 23 | 14327582 |
| 24 | 23711567 |
| 25 | 38937304 |
| 26 | 63471475 |
| 27 | 102741924 |
| 28 | 165204561 |
| 29 | 263956121 |
| 30 | 419183458 |
| 31 | 661833319 |
| 32 | 1039140705 |
[1,3,10,28,72,172,397,867,1840,3783,7580,14829, 28454,53540,99119,180676,324758,576145,1010051, 1750782,3003386,5101769,8586891,14327582,23711567, 38937304,63471475,102741924,165204561,263956121, 419183458,661833319,1039140705] |