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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 74 |
| 6 | 372 |
| 7 | 1764 |
| 8 | 9076 |
| 9 | 51988 |
| 10 | 292392 |
| 11 | 1967338 |
| 12 | 12930510 |
| 13 | 91859738 |
| 14 | 702084750 |
| 15 | 5271114798 |
| 16 | 46825411464 |
[1,2,6,24,74,372,1764,9076,51988,292392,1967338, 12930510,91859738,702084750,5271114798, 46825411464] |