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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 324 |
| 3 | 157464 |
| 4 | 688747536 |
| 5 | 27113235502176 |
| 6 | 9606056659007943744 |
| 7 | 30630314141519043787530624 |
| 8 | 879023057994883196072409366855936 |
| 9 | 227034361980435338213503810877004745115136 |
[1,6,324,157464,688747536,27113235502176, 9606056659007943744,30630314141519043787530624, 879023057994883196072409366855936, 227034361980435338213503810877004745115136] |