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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 34 |
| 4 | 1952 |
| 5 | 18664632 |
| 6 | 12813206150470528 |
| 7 | 33758171486592987151274638874693632 |
| 8 | 1435913805026242504952006868879460423801146743462225386100617731367239680 |
[1,1,4,34,1952,18664632,12813206150470528, 33758171486592987151274638874693632, 14359138050262425049520068688794604238011467434622\ 25386100617731367239680] |