The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 21 |
| 3 | 115 |
| 4 | 346 |
| 5 | 797 |
| 6 | 1647 |
| 7 | 3164 |
| 8 | 5801 |
| 9 | 10285 |
| 10 | 17802 |
| 11 | 30271 |
| 12 | 50803 |
| 13 | 84434 |
| 14 | 139317 |
| 15 | 228647 |
| 16 | 373778 |
| 17 | 609265 |
| 18 | 991403 |
| 19 | 1610788 |
| 20 | 2614335 |
| 21 | 4238923 |
| 22 | 6868858 |
| 23 | 11125331 |
| 24 | 18013845 |
| 25 | 29161100 |
| 26 | 47199305 |
| 27 | 76387375 |
| 28 | 123616440 |
| 29 | 200036551 |
| 30 | 323688895 |
| 31 | 523764716 |
| 32 | 847496451 |
[2,4,21,115,346,797,1647,3164,5801,10285,17802, 30271,50803,84434,139317,228647,373778,609265, 991403,1610788,2614335,4238923,6868858,11125331, 18013845,29161100,47199305,76387375,123616440, 200036551,323688895,523764716,847496451] |