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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 2 |
| 7 | 8 |
| 8 | 38 |
| 9 | 219 |
| 10 | 1404 |
| 11 | 9714 |
| 12 | 70454 |
| 13 | 527235 |
| 14 | 4037671 |
| 15 | 31477887 |
| 16 | 249026400 |
| 17 | 1994599707 |
| 18 | 16147744792 |
| 19 | 131959532817 |
| 20 | 1087376999834 |
| 21 | 9027039627035 |
| 22 | 75441790558926 |
| 23 | 634311771606750 |
| 24 | 5362639252793358 |
| 25 | 45565021714371644 |
| 26 | 388937603694422120 |
| 27 | 3333984869758146814 |
[1,2,8,38,219,1404,9714,70454,527235,4037671, 31477887,249026400,1994599707,16147744792, 131959532817,1087376999834,9027039627035, 75441790558926,634311771606750,5362639252793358, 45565021714371644,388937603694422120, 3333984869758146814] |