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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 15 |
| 4 | 63 |
| 5 | 223 |
| 6 | 1007 |
| 7 | 3987 |
| 8 | 17731 |
| 9 | 72801 |
| 10 | 332205 |
| 11 | 1419247 |
| 12 | 6445743 |
| 13 | 27950963 |
| 14 | 128654771 |
| 15 | 569100817 |
| 16 | 2614464453 |
| 17 | 11656479779 |
| 18 | 53994824919 |
| 19 | 243589190703 |
| 20 | 1127393066207 |
| 21 | 5110585702669 |
| 22 | 23786648346813 |
| 23 | 108663988634677 |
| 24 | 505588687584117 |
| 25 | 2317135339756865 |
| 26 | 10825211344617269 |
| 27 | 49882062098721267 |
[1,1,5,15,63,223,1007,3987,17731,72801,332205, 1419247,6445743,27950963,128654771,569100817, 2614464453,11656479779,53994824919,243589190703, 1127393066207,5110585702669,23786648346813, 108663988634677,505588687584117,2317135339756865, 10825211344617269,49882062098721267] |