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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 65 |
| 5 | 241 |
| 6 | 901 |
| 7 | 3361 |
| 8 | 12545 |
| 9 | 46817 |
| 10 | 174725 |
| 11 | 652081 |
| 12 | 2433601 |
| 13 | 9082321 |
| 14 | 33895685 |
| 15 | 126500417 |
| 16 | 472105985 |
| 17 | 1761923521 |
| 18 | 6575588101 |
| 19 | 24540428881 |
| 20 | 91586127425 |
| 21 | 341804080817 |
| 22 | 1275630195845 |
| 23 | 4760716702561 |
| 24 | 17767236614401 |
[1,1,5,17,65,241,901,3361,12545,46817,174725, 652081,2433601,9082321,33895685,126500417, 472105985,1761923521,6575588101,24540428881, 91586127425,341804080817,1275630195845, 4760716702561,17767236614401] |