| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 22 |
| 6 | 78 |
| 7 | 315 |
| 8 | 1417 |
| 9 | 7087 |
| 10 | 38981 |
| 11 | 233887 |
| 12 | 1520268 |
| 13 | 10641881 |
| 14 | 79814109 |
| 15 | 638512875 |
| 16 | 5427359437 |
| 17 | 48846234937 |
| 18 | 464039231906 |
| 19 | 4640392319062 |
| 20 | 48724119350156 |
| 21 | 535965312851718 |
| 22 | 6163601097794765 |
| 23 | 73963213173537187 |
| 24 | 924540164669214843 |
| 25 | 12019022140699792968 |
[1,1,3,7,22,78,315,1417,7087,38981,233887,1520268, 10641881,79814109,638512875,5427359437, 48846234937,464039231906,4640392319062, 48724119350156,535965312851718,6163601097794765, 73963213173537187,924540164669214843, 12019022140699792968] |