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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 104 |
| 6 | 604 |
| 7 | 4204 |
| 8 | 32204 |
| 9 | 272204 |
| 10 | 2072204 |
| 11 | 22072204 |
| 12 | 242072204 |
| 13 | 2642072204 |
| 14 | 28642072204 |
| 15 | 308642072204 |
| 16 | 4808642072204 |
| 17 | 68808642072204 |
| 18 | 1088808642072204 |
| 19 | 19088808642072204 |
| 20 | 209088808642072204 |
| 21 | 4209088808642072204 |
| 22 | 88209088808642072204 |
[1,1,2,6,24,104,604,4204,32204,272204,2072204, 22072204,242072204,2642072204,28642072204, 308642072204,4808642072204,68808642072204, 1088808642072204,19088808642072204, 209088808642072204,4209088808642072204, 88209088808642072204] |