| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 8 |
| 7 | 20 |
| 8 | 45 |
| 9 | 89 |
| 10 | 174 |
| 11 | 323 |
| 12 | 590 |
| 13 | 1048 |
| 14 | 1834 |
| 15 | 3135 |
| 16 | 5361 |
| 17 | 8977 |
| 18 | 14993 |
| 19 | 24859 |
| 20 | 41115 |
| 21 | 67329 |
| 22 | 110393 |
| 23 | 179756 |
| 24 | 292449 |
| 25 | 473375 |
| 26 | 766821 |
| 27 | 1237931 |
| 28 | 2001784 |
| 29 | 3225214 |
| 30 | 5198844 |
| 31 | 8380166 |
| 32 | 13515976 |
| 33 | 21751675 |
| 34 | 35055227 |
| 35 | 56462204 |
| 36 | 91065029 |
| 37 | 146752097 |
| 38 | 236629845 |
| 39 | 381499674 |
[0,0,0,1,3,8,20,45,89,174,323,590,1048,1834,3135, 5361,8977,14993,24859,41115,67329,110393,179756, 292449,473375,766821,1237931,2001784,3225214, 5198844,8380166,13515976,21751675,35055227, 56462204,91065029,146752097,236629845,381499674] |