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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 27 |
| 5 | 31 |
| 6 | 89 |
| 7 | 120 |
| 8 | 809 |
| 9 | 929 |
| 10 | 2667 |
| 11 | 3596 |
| 12 | 24243 |
| 13 | 27839 |
| 14 | 79921 |
| 15 | 107760 |
| 16 | 726481 |
| 17 | 834241 |
| 18 | 2394963 |
| 19 | 3229204 |
| 20 | 21770187 |
| 21 | 24999391 |
| 22 | 71768969 |
| 23 | 96768360 |
| 24 | 652379129 |
| 25 | 749147489 |
| 26 | 2150674107 |
| 27 | 2899821596 |
[1,1,3,4,27,31,89,120,809,929,2667,3596,24243, 27839,79921,107760,726481,834241,2394963,3229204, 21770187,24999391,71768969,96768360,652379129, 749147489,2150674107,2899821596] |