The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 15 |
| 4 | 35 |
| 5 | 74 |
| 6 | 146 |
| 7 | 277 |
| 8 | 511 |
| 9 | 925 |
| 10 | 1651 |
| 11 | 2916 |
| 12 | 5108 |
| 13 | 8889 |
| 14 | 15385 |
| 15 | 26507 |
| 16 | 45491 |
| 17 | 77806 |
| 18 | 132678 |
| 19 | 225645 |
| 20 | 382835 |
| 21 | 648121 |
| 22 | 1095075 |
| 23 | 1846920 |
| 24 | 3109800 |
| 25 | 5228209 |
| 26 | 8777261 |
| 27 | 14716167 |
| 28 | 24643331 |
| 29 | 41220050 |
| 30 | 68873786 |
| 31 | 114964741 |
| 32 | 191719783 |
[1,5,15,35,74,146,277,511,925,1651,2916,5108,8889, 15385,26507,45491,77806,132678,225645,382835, 648121,1095075,1846920,3109800,5228209,8777261, 14716167,24643331,41220050,68873786,114964741, 191719783] |