The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 85 |
| 3 | 377 |
| 4 | 1289 |
| 5 | 3653 |
| 6 | 8989 |
| 7 | 19825 |
| 8 | 40081 |
| 9 | 75517 |
| 10 | 134245 |
| 11 | 227305 |
| 12 | 369305 |
| 13 | 579125 |
| 14 | 880685 |
| 15 | 1303777 |
| 16 | 1884961 |
| 17 | 2668525 |
| 18 | 3707509 |
| 19 | 5064793 |
| 20 | 6814249 |
| 21 | 9041957 |
| 22 | 11847485 |
| 23 | 15345233 |
| 24 | 19665841 |
| 25 | 24957661 |
| 26 | 31388293 |
| 27 | 39146185 |
| 28 | 48442297 |
| 29 | 59511829 |
| 30 | 72616013 |
| 31 | 88043969 |
[1,13,85,377,1289,3653,8989,19825,40081,75517, 134245,227305,369305,579125,880685,1303777, 1884961,2668525,3707509,5064793,6814249,9041957, 11847485,15345233,19665841,24957661,31388293, 39146185,48442297,59511829,72616013,88043969] |