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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 52 |
| 4 | 576 |
| 5 | 7591 |
| 6 | 114365 |
| 7 | 1923185 |
| 8 | 35541761 |
| 9 | 714104502 |
| 10 | 15475682769 |
| 11 | 359547718332 |
| 12 | 8911727170149 |
| 13 | 234697278951915 |
| 14 | 6544781944957233 |
| 15 | 192669771715328227 |
| 16 | 5971713743277322517 |
| 17 | 194402722591654350978 |
[1,1,6,52,576,7591,114365,1923185,35541761, 714104502,15475682769,359547718332,8911727170149, 234697278951915,6544781944957233, 192669771715328227,5971713743277322517, 194402722591654350978] |