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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 13 |
| 6 | 49 |
| 7 | 332 |
| 8 | 3073 |
| 9 | 36531 |
| 10 | 597879 |
| 11 | 14127501 |
| 12 | 454449581 |
| 13 | 20354788308 |
| 14 | 1267965991925 |
[1,1,1,1,13,49,332,3073,36531,597879,14127501, 454449581,20354788308,1267965991925] |