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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 12 |
| 4 | 63 |
| 5 | 429 |
| 6 | 3716 |
| 7 | 40272 |
| 8 | 541655 |
| 9 | 9022405 |
| 10 | 186233087 |
| 11 | 4771577072 |
| 12 | 152050410552 |
| 13 | 6037181967007 |
| 14 | 299176055730253 |
| 15 | 18530408350215038 |
| 16 | 1436276193993882859 |
| 17 | 139462485162718679221 |
| 18 | 16980510121067921518710 |
[1,1,3,12,63,429,3716,40272,541655,9022405, 186233087,4771577072,152050410552,6037181967007, 299176055730253,18530408350215038, 1436276193993882859,139462485162718679221, 16980510121067921518710] |