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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 17 |
| 6 | 35 |
| 7 | 163 |
| 8 | 959 |
| 9 | 6943 |
| 10 | 61513 |
| 11 | 740733 |
| 12 | 9820359 |
| 13 | 193942865 |
| 14 | 4360418313 |
| 15 | 137513801459 |
[1,1,1,5,17,35,163,959,6943,61513,740733,9820359, 193942865,4360418313,137513801459] |