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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 228 |
| 4 | 252642 |
| 5 | 3286762710 |
| 6 | 423091508279496 |
| 7 | 488322998306377824150 |
| 8 | 5405955851967092442258037800 |
| 9 | 561273297862912365721571649672300480 |
| 10 | 524055990531978935668322776302483856990581000 |
[1,1,2,228,252642,3286762710,423091508279496, 488322998306377824150, 5405955851967092442258037800, 561273297862912365721571649672300480, 524055990531978935668322776302483856990581000] |