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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 62 |
| 6 | 908 |
| 7 | 24698 |
| 8 | 1232944 |
| 9 | 112018190 |
| 10 | 18410581880 |
| 11 | 5449192389984 |
| 12 | 2894710651370536 |
| 13 | 2752596959306389652 |
| 14 | 4675651520558571537540 |
| 15 | 14163808995580022218786390 |
| 16 | 76413073725772593230461936736 |
[1,1,2,8,62,908,24698,1232944,112018190, 18410581880,5449192389984,2894710651370536, 2752596959306389652,4675651520558571537540, 14163808995580022218786390, 76413073725772593230461936736] |