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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 38 |
| 6 | 87 |
| 7 | 191 |
| 8 | 420 |
| 9 | 908 |
| 10 | 1954 |
| 11 | 4160 |
| 12 | 8816 |
| 13 | 18549 |
| 14 | 38851 |
| 15 | 80965 |
| 16 | 168077 |
| 17 | 347566 |
| 18 | 716443 |
| 19 | 1472344 |
| 20 | 3017866 |
| 21 | 6170789 |
| 22 | 12590805 |
| 23 | 25640050 |
| 24 | 52122784 |
| 25 | 105791068 |
| 26 | 214413852 |
| 27 | 434007488 |
| 28 | 877480395 |
| 29 | 1772235212 |
| 30 | 3575967030 |
| 31 | 7209301989 |
| 32 | 14523006820 |
[1,1,3,7,17,38,87,191,420,908,1954,4160,8816, 18549,38851,80965,168077,347566,716443,1472344, 3017866,6170789,12590805,25640050,52122784, 105791068,214413852,434007488,877480395, 1772235212,3575967030,7209301989,14523006820] |