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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 61 |
| 5 | 221 |
| 6 | 244 |
| 7 | 884 |
| 8 | 8671 |
| 9 | 24371 |
| 10 | 24784 |
| 11 | 86594 |
| 12 | 881371 |
| 13 | 2472671 |
| 14 | 2435494 |
| 15 | 8890784 |
| 16 | 86518771 |
| 17 | 245730371 |
| 18 | 247064194 |
| 19 | 883821494 |
| 20 | 8892467671 |
| 21 | 24353948771 |
| 22 | 24579870784 |
| 23 | 86514795194 |
| 24 | 883095920371 |
| 25 | 2470481916671 |
| 26 | 2433383690494 |
[1,2,4,8,61,221,244,884,8671,24371,24784,86594, 881371,2472671,2435494,8890784,86518771,245730371, 247064194,883821494,8892467671,24353948771, 24579870784,86514795194,883095920371, 2470481916671,2433383690494] |